I'm new to BPs and have had my female for about 2 months. I got her at a pet store and she was overall pretty thin and even slightly wrinkly in the neck when I got her. She eats fine but I have not seen her sip from the water bowl the way my bumble bee does.

Since I got her, I'd say her tone has been a bit dull. 16 days ago her eyes fogged up and I fed her and then left her be. Around this time I got my hygrometer in the mail and noticed the humidity in my room was about 25% (god damn Massachusetts winter) and immediately wrapped the lid in foil and bought a humidifier, where I've managed to keep the tank at 70-80% since. 7 days in she broke a bit of skin loose around her lip and on one side of her face. About 10 days in I noticed that she was getting wrinkly, like, really wrinkly. I soaked her for about 15 minutes in 85ish degree water, figuring she was a bit dehydrated but not too far off from the norm. It was only 15 minutes because she was thrashing around like crazy and I felt bad. At day 14 she did not look to be having a good time. At this point, the wrinkles went from being solely across her body the short way to being somewhat visible down the length of the snake, especially around the neck. On Day 15 I put the snake in another bath because it was clear to me that dehydration was a big issue here. Kept her in for 30 minutes and she seemed less freaked out this time. Last night, I bathed her for 30 minutes, changed the water, and left her for another 30. This time I could see her rubbing against the bath towel that I left in the tub. After the tub, I left her in a pillow case with a wet towel in her cage at 83ish degrees for another 30 minutes. The bath literally appeared to have plumped her up. My best analogy here is that she looked very much like a raisin and got rehydrated into a grape. She's a little bit wrinkly today but not even close to what she was a few days ago. I think I will continue daily baths until she looks normal.

TL;DR (dang, you're probably mad that you read all of that when here's the really simple question)

At what point (days, visible cues, whatever) do I need to manually aid in her shed? I have some shed aid. When do I need to aid at least the tip of her tail as a bare minimum? Any suggestions for this process? I'm getting the impression that she's either too weak to rub or doesn't know how.

HAAAAAAAAALP!