Well, you know how difficult specie females can be at times.....
Mikey may have a better solution for you, with using two perches.....I've never had to use perch sticks, so didn't think of it.....I just suffered through the angry bites.....
You can help the scratches by clipping her toenails, but you might need help & may have to towel her since she's being difficult.....you can use an emery board or nail clippers to just take the very tip of the nail off.....you don't need to take more off unless the nails appear overgrown, then I would leave that to an avian vet.....
A nail grooming/concrete perch mounted so that she would perch on it to eat or drink will let her keep her own nails manicured.....be sure to only get the kind that are smooth on the top & bottom & rough on the sides.....they're not expensive & maybe none for both the food & water bowls will be sure to get the job done.....