That is horrible. She sounds like she is in a bad place.
Do you have pictures of her before and now? Any emails that shows that they'll properly care for her and give her back when you came back? That could be used as evidence if you were to take legal action if they continue to refuse you.
You can move a snake 24-42 hours after it eats. If she was fed on Tuesday, then she can be moved now. I would try to get her ASAP.
I would be so angry if anyone did that to my animals. You paid for her care, so it is unacceptable that she was neglected so badly.
If you text them and they continue to ignore you, I would just knock on their door. "Hey guys! I sent a few texts, but never heard back. I had time, so I came to pick up my snake."