1. You shouldn't have to sterilize the area. I never have when there was a rodent left in the morning. It might be a preference. Others may advise differently/better than me.
2. Try moving the hide and see how she is after that. If it's on the cool side now and that's where she is all the time it means she is either hot or that hide makes her feel the most secure. If she is choosing security over warmth, she may not eat in her "cooled" state. Do you have an identical one to put on the hot side? That may help the situation.
3. Offer food on your regular feeding day. She'll take it when she takes it. She could be in shed or on feed strike.
4. Not sure how often a 350g bp should shed. If you think she could be in shed, raise the humidity a bit for about a week and see if she does or not. I wouldn't be too concerned with it though, it sounds like it could be an odd occurrence but you also don't know how often she was shedding before you got her.
Other point of note: When you cleaned and rearranged her tank. Did you add/subtract anything or just put everything in a different location? This could be a huge change for her and she may not like it so she stays in her favorite hide for comfort.