California King snake question?? Please Help?

My king snake has not been moving much the last 3 days and constantly stays burrowed (not her typical behavior, usually very active). At first I thought she was shedding but it’s been longer than normal and her skin has not started peeling. So, I picked her up and she didn't feel as firm as she normally does. I'm really worried and nothing in her tank has been out of the ordinary. So I'm wondering if anyone knows what could be wrong and should I take her to the vet? I already would have taken her but a reptile vet is over 100 miles away from where I live. Please, someone with some knowledge and or experience on the matter help me.