Okay, that makes more sense now- about the temps & hide. (One hide isn't optimal, but I'm sure you know that.)
She should be digesting just fine, even with only the ambient temp. around 75*, so the real problem HAS to be feeding too much & too often- piling more on before she's finished digesting the previous meal. Make sure they let that poor snake digest one meal at a time.It's a wonder she hasn't barfed up.
Right now I'd feed her on the "long side" (every 14 days) to let her stomach get back on track, & that's ONLY IF & WHEN there's NO bulge left from the previous meal, okay? And smaller mice if you can, also. If she doesn't act hungry, don't worry about persuading her, let her skip a meal too.
And NO handling when she's still digesting (if there's a visible bulge). She might need longer to digest (due to age or just poor digestion); for most snakes, a bulge from a meal takes about 2 days to be gone, but handling might have interfered too.