You got her a couple days ago, right? Could take her a while to settle in and want to eat. Once you get better pics of the bump, I'd back off and not handle her for a week and let her chill in her new home. Then try feeding her again. Do you know what she was eating in her last home (mice v. rats, FT v. live)?

I assume you're keeping her warm and giving her a snug hiding spot?