You can safely feed her as much as she will eat in 15 minutes, just make sure they are smaller than the distance between her eyes. You may want to just feed a few at a time, until she is done, to make sure she is able to hold and not regurgitate (throw up) any.
As for the reflection, I had an issue with an infant like that, and all I did was paper the inside of the viv, until he was more comfortable with his surroundings, than removed a bit at a time.
Hope this helps out !
Janie.