My birdie has strange droppings and a slight tremor

Good day to whoever reading this!
I have a 1,5-year female. And I'm afraid that she's been sick for 2 weeks now. I didn't give her any medical supplies as of now 'cause I don't know what type of disease it might be. I didn't take her to the ornithologist either 'cause we don't have one in the city (I live in Astana, Kazakhstan). There are no ornithologists at all here in our city and the veterinary laboratory refuses to do tests. I do not know where to take her now in such state, so I don't know what to do with all of this.
The reason why I created this thread is due to the concern of my bird's droppings. The droppings are pretty watery. Amongst other symptoms: poor watery droppings, trembling, weight loss (even though she has a quite good appetite). Here is the photo of her droppings. I can't call the droppings stable: it is constantly liquid, but the consistency is constantly changing. It can be just water with something white; then, in 10 minutes, poop without water, but very watery and the colour is bright green; the next time the colour is white-green and the litter is circular-shaped and so on. But she does not have a "healthy" litter (in the shape of a tube) right now. Very often I see how she trembles a little: wings and tail specifically, but she behaves, at the same time, very active. Paws are always hot. I tried to warm her up under the lamp, but she freaks out, tries to run away. But it's pretty warm inside the flat anyway. The bird has bad droppings, and she shakes a little while sitting, but by behaviour, it can not be said that she feels sick. She eats well but continues to lose weight. Behaves actively, constantly trying to play, but she trembles at the same time. I can't name exactly the consistency of the droppings, it constantly changes its shape and form, but the common feature is watery consistency. As an example, I attached one more photo. And here is the photo of the bird itself, at the moment of "a fit of trembling," I do not know how to properly call it.
I put fresh apples into her cage every day, also, depending on the day, I give her: buckwheat, corn, carrots, cucumbers and beets. I make sure that she always has fresh veggies. But she still losing weight, though eats actively. Once in 10 minutes, she leaves stable droppings, about 10 heaps per hour. And one more thing. Sometimes (2-3 times a day) she has a two-three-minute moment when she's like freezing in place then she sits, trembles a bit and slightly lifts her wings. And then right after this 2-3 minute freezing, she starts to behave actively again as if nothing happened.
I'm desperate and don't know what to do. I will be very grateful for any help provided!

Please contact a Certified Avaian Vet, by e-mail or phone, if there are none in your city. Birds hide illness as uch as possible, so by the time we notice anything, the bird is usually quite ill. Cut back on the watery fruits and veggies, see if that makes a difference in her poops, but really this is beyond the scope of the members here, none of us are CAVs. Try to get this done ASAP, 2 weeks of abnormal poops and behaviour is a long time in bird lillnesses. They instinctually hide illness because the sick ones get picked off in the wild. Good luck and I hope your baby improves with good advice and medicine. As a last resort, try the place you bought him from, they may have the name and number of a CAV to call.

As mentioned above you need to find her a certified avian vet. Even a regular vet may possibly be able to help. If there is none near you, is there a way for you to drive? My avian vet is two hours away and it's a little drive but well worth it for proper diagnosis and care.

Without proper medical care and tests done, I'm afraid your cockatiel may only get worse. Please act now!

Thank you for your answers and words of support, but as I mentioned, we don't even have a non-certified avian vet. And there are none in the scope of 2-3 hours driving. If I had such an opportunity of showing my baby to CAV or AV - I would do it instantly. And I wouldn't have written about our problem here. So simply put - we're on our own with her. So I'm seeking any advice or help from someone who might have encountered it in the past and might know what type of disease that is or whatever that is happening to her.

there's honestly no way to tell what kind of disease they have just based on poop and tremors. Pretty much everything from a bird version of the common cold to the most deadly viruses. Unfortunately nobody here is a vet so we couldn't even begin to offer suggestions for a course of action

2-3 hours is what many members here do to get to their vet. You may just have to get driving. Or possibly there is a Vet nearby you don't know of, knowing where you are from people here may know of a vet you can go to

OP seems to have done what she can for where she lives, and taking the bird to an Avian vet may not even be an option at all anywhere in her country. I agree that if OP can call an Avian vet for advice, that would be your best option.

Look at what has changed the past two to three weeks. Has the bird come into contact with a new food? Have they begun to chew on any new items when out, especially anything metal? A new cage? A new toy? Metal toxicity could possibly cause these problems so rule that out first. Only stainless steel, nickel plated, and powder coated metal is safe.

Granted, like everyone else, I am no CAV. But my first instinct is that this is diet related, since the bird otherwise has a good appetite and is active. A nutritional deficiency can cause tremors. Poop consistency can vary depending on what the bird has eaten recently. Fruits and vegetables cause a more watery poop and can retain a color similar to what the food is. Poop from seed has a more solid consistency. What is the full diet that you feed the bird? How long have you had this bird? If the bird had previous owners, what did they feed it and how did the bird(s) under their care look?

Research what the cockatiel's natural diet is in Australia and try to match it as closely as you can. They do have a good portion of seed in their diet.

Here is a link that shows some possibilities of conditions related to weight: https://www.beautyofbirds.com/birdweight.html

What a situation.

Do you have any local experts/breeders/other bird owners whom you could ask?

Best of luck to you and your beautiful little bird!