Definitely vet time! Also QT!! Those symptoms do not sound good but obviously I can't diagnose an illness. If the worst case scenario were to happen and she passes away before you can get her to a vet you should get a necropsy done. If its a serious disease you need to know and let the pet store know, especially because she was with other pythons.
I know its tempting to "rescue" sick pet store snakes but you are taking a risk in spreading what ever they have to your collection and facing vet bills as well.