First time owner, please advise *long post*

[PrincessBunny]

Hello, I have adopted a BP that I don’t even know if I should call neglected or abused. When I first knew of her existence she was living in a 10g tank with no hides and covered in poop everywhere. I assumed the person had JUST gotten her and was in the process of setting up an actual enclosure, I was also under the assumption she was a juvenile bc of her size. Not even a month later we found out the person wanted to get rid of “it” ASAP and was just willing to give it away to whoever asked. My initial reaction was try and get the person to delay the decision while I looked for a person who would properly take care of her but I was rejected and pretty much given the weekend to either find someone or keep it before she was discarded. This has been the most stressful weekend trying to AT LEAST set up something decent so I can keep her safe but with that little time I have less than ideal resources. I got a 36x18x18 glass enclosure thinking that she would quickly outgrow the tiny tank she was kept in, as the days went by I found more and more unpleasant information, whether is all true or not I’ll never know. First off, apparently she is 3 years old but she seems way too small for that, I know they grow their entire lives but slow down significantly after the first few years so I’m worried about her being too stressed in the new enclosure. The person I got her from said to “feed whenever” and clean when there’s “too much poop”, I absolutely believe those were her conditions for years because the tank is absolutely repulsive, its filled with **** and reeks of urine but I am afraid of handling her yet bc of the stress of moving and due to the fact that she is shedding and this person did not think it necessary to tell me until I was there. The tank besides foul smelling was absolutely dry as in DRY, the water bowl had not just been emptied bc it was dry and dusty. Claims were made that she “sheds in pieces” so to just mist whenever I ser her shedding. I misted some warm water upon arriving home and cleaned and filled her water bowl, she literally LICKED the droplets out of the glass and once I put in the water bowl she dunked her entire head in and drank for what it seemed forever. I know this seems more like ranting at this point but I want to provide as much information as possible so I get the proper advice. Once misted and kept warm she shed mostly in one piece and now she is just in her hide. My question is, how do I safely handle her so I don’t hurt her and I can clear the tank? Should I return the big tank for something smaller? She has never been to the vet so I got her insurance and an appointment and hopefully get more information but they couldn’t see it until a week and a half from now that is why I’m hoping to keep her as comfortable as possible until then. I love snakes so while not entirely clueless I am a firm believer that theoretical knowledge will never come close to experience, I have never owned one or set up a tank myself and I am having issues with keeping the heat and humidity at optimal levels. It reads OK for the most part but since I already have her with me I figured I no longer have the pressure of time and can do it properly so I discarded the exo terra heat mat I previously got, I am also still waiting on the laser thermometer so make sure that the readings are accurate. I am sorry for the long post, I am not entirely sure it even makes good sense at all since I feel extremely distressed about the situation. I am waiting on an ultratherm uth but I can still cancel and get a smaller one. Should I continue to acclimate the big tank or does it make more sense to get a smaller one due to her size? I will post pictures later and hopefully I can weigh her too to give you a better idea. Right now my urgency is to clean the tank but also stress her the least possible and not hurt her since she is shedding. Thank you in advance 💕