Take her out of there ASAP. They obviously don't give a lick about her. I doubt they're going to start because you lectured them if they were willing to let the snake just wither away and die because the owner wasn't around. I'd go for a 15 qt (4 dollars), she'll probably be stressed in something as big as a 41 qt. You can get a hydrofarm thermostat for the heat pad online and have it shipped in a couple days, use overhead lighting until then. Don't jump her temps too high too fast, or feed her too big food. Just ease her into actually being taken care of.