Thanks for the input. I did some searching online and found pics of carpets eating pretty big stuff so I don't think the size of the mice is the issue - most likely she's just not fully settled in yet. She tends to spend all day in her belly-heated hide log and then come out some at night. Hopefully as she acclimates I'll see her outside more during the daytime as well. When I take her out she seems pretty mellow and has never tried to bite. She will explore a bit and sometimes she is a little startled by an unexpected touch but not that bad - it's not like she tries to take off running.

Her last meal was about two weeks ago so she's definitely "due" and I'd hoped she was only refusing due to being in shed but I'll go ahead and give her a bit longer.