Hi
No, you are not going to take her back, there that pressure of making that decision has been taken off your shoulders.
Don't give up on her that easily, these gecko are worth the effort and time we put into taking care of them.
You really need to calm down a relax and just give her some time. She will calm down a relax at her own pace, but you just need to hold on and give her time.
We now that you are concerned and worried and so is everyone when they get a new gecko.
We will all be here for you to vent any frustrations out with, and yes, waiting for her to get settled in and comfortable is hard to do, but you just really have to give her, her own space and she will settle in when she is ready.
It is like the story of watching the pot boil, as long as you are watching it, it won't, but as soon as you stop it will.
Another thing to think about, is that animals can sometimes pick up on there owner moods, for example- when you are stressed,worried,hurt,sad etc..
Just give her a couple weeks or so to settle in, she will.
Take Care, TLB