Whoa, whoa, whoa. Easy, Heedless. Just take a few deep breaths and take a step back. It isn't time yet to start contemplating giving Kise away. Remember, with birds most behavioral fixes aren't overnight.
First, remember that you can't allow yourself to interpret her behavior the way you would a fellow human. Sure, your feelings are hurt. But her lashing out at you is not the same thing as a person lashing out at you. She's not doing it to be hurtful. She doesn't "hate" you. There's something going on with her and she's reacting in a way that is completely natural for her given her hard-wired instincts. Nothing more, nothing less.
If she's indeed only one, she's too young for hormones to be the issue. Owlet's suggestion about keeping an eye out for anything that may have changed is a good one. (Jolly once held a grudge against my niece for around 6 months for a one-time mistake of painting her fingernails lilac. Flew in a dead panic the instant she'd show her face every time! For half a year! Lol!) But know what I noticed from your posts? A lot of this behavior seems to be happening around her cage. It's definitely not too early for her to begin exhibiting territorial behaviors. These behaviors tend to be especially strong and... enthusiastic... when it comes to female ekkies. Why? Because in the wild, the female ekkies are the ones who defend the nest hollows against all comers ranging from competing cockatoos to snakes. So they are hard-wired to be somewhat badass.
On top of this, keep in mind that we, as human beings, tend to miss the majority of avian body language. I've observed the subtle, seemingly telepathic, communication between Jolly and Maya. I consider myself decent at reading bird body language, but he
definitely sees things that I don't. I believe that the things we see are really the tip of the iceberg. So sometimes when we get bitten, I truly believe it is a bite out of exasperation. Basically their last resort. (We must seem either really obnoxious or mind-numbingly dense to them most times.)
So all this said, what to do about it? First, stop sticking your hands into her cage while she's in it. Don't put yourself in situations where she will feel compelled to bite you. Last thing you want is for her to become comfortable with the idea of biting you as a means of communication. Have her climb up onto a stick/portable perch from within her cage rather than your hand. Once she's on the stick, try taking her to another room out of sight of the cage. If she stops exhibiting hostile behavior when she can't see her cage, you have your answer as to the why.
Targeting also works well, here. it keeps your hands out of biting range until it's safe for you.
Here are links that you may find helpful. The first helps with identifying the cause of the biting. (Territorial behavior is the most likely suspect in my opinion at the moment, but keep an open mind for other possibilities. Not to mention that, since you accidentally swatted her away, the trust may have been temporarily damaged.) And the second is for bite-pressure training.
http://www.parrotforums.com/training/57935-brainstorming-biting-parrots.html
http://www.parrotforums.com/training/63988-bite-pressure-training.html
Don't give up, my friend. I see your love for Kise in all of your posts. She's testing you at the moment, but you can weather this storm. It's a marathon, not a sprint. Just be consistent and patient.
Look at the BALD SPOT on her head.... 
