[Help] Third month of Baby Hognose not eating. Please help!

Hi guys!

So we got our little hognose Penelope in early October. We got her from a local breeder and he says she was on unscented frozen thawed pinkie mice. It is now the middle of January and she has not eaten a single meal from us. She was in a 5g, but we downsized her to a 2g critter keeper in hopes that it’ll make her more secure. Hot side stays around 90, cold side around 75. Humidity stays around 40. She’s only lost 1 gram so far (went from 13 to 12 grams). We have taken her to the vet twice. The first time we put her on a course of antibiotics for a suspected respiratory infection. The second time she was given a clean bill of health. However, not she is getting much less active and staying in her hide all day. I’m so worried that she’s dying or very sick. Here’s some of the things we’ve tried so far to get her eating.

Tried just drop feeding the mouse into the enclosure. Tried cutting off the pinkies head so it’s a smaller meal Scented it with tuna juice Placed her in a deli cup with the mouse inside (did not work at all because she tried to get out the entire time).

I went to the reptile expo for advice and a lot of them said that the breeder maybe lied to me and she was never on frozen thawed. Should I start feeding live? Need some advice on how to move forward.