If she's staying on the warm side all the time she's not warm enough. What kind of thermometer are you using? Are you sure it's accurate? I keep my Balls hot spot at around 95. You said a couple times "when I hold her". You should not hold her unless you absolutely have to until she is eating regularly and is stronger. I would not stress her out more by taking her to the pet store or assist feed her yet. Give her more time to settle in and start eating on her own. It's hard to tell her condition from pics and a description, but to be honest if she is really weak she probably would not survive the stress of a trip to the pet stop and assist feeding or especially (I know you didn't say this, I'm just saying) force feeding. Hope everything turns out OK.