Crank up the ambient so that she has a basking area of 88-90F for a few hours a day, but can also escape to lower temps when she's had enough.
If this were my snake and she was continuing to show behavioral changes, she'd probably be going on a light prophylactic dose of a broad spectrum antibiotic. My pick is Fortaz (Ceftazidime) every 72 hours, intramuscular, 20mg/kg in a situation like this. Get your vet to prescribe some if he or she agrees that it is warranted.
Waggies are very easy to handle and tube and give their shots to. Find detailed instructions on venomous veterinary restraint at
www.snakegetters.com.