Young ball python will not eat anything I offer! Help!

[Sweetroyboy]

I got a ball python from Petco almost 2 months ago. Her tank has all the correct conditions, and she has settled in. I have tried feeding her both frozen pinkies and fuzzies, and she completely ignores them. Sometimes she will lay on them and act like it's her baby. I've tried wiggling it with tongs, leaving them alone, everything. I took her to the vet, they x-rayed her and it was all clean, she had lost some weight though due to her not eating. Which definitely worries me. The vet showed me how to tube feed her, and so I've been doing that for a few weeks. She was still active and not acting like she was hungry, but just recently she began throwing up, despite not being fed. We had left for a trip, and a friend was watching her, so she was not being tube fed at the time she was throwing up. They took her to the vet and they gave her antibiotics that could help. They didn't know what the problem was though. I'm hoping the medicine will help. Last night i got a small feeding mouse for her. But with all the "dangers" of giving my small baby a live mouse, I decided to kill it and then feed it to her. Nothing. She once again ignored it. I need some help. She is getting ready to shed, so maybe that's why she didn't eat the mouse last night? I'm not sure, but in any case I really need help. Plus, killing that poor mouse was awful, so having my girl not eat it was depressing.
Please help me with my stubborn Ayame. Thank you!