It's terribly frustrating to be where you are.. Especially given the other animals are in the exact same environment and feeding fine.. I feel for ya man.. This is one of the times that people come to the forum and are truly in need of help and have exhausted pretty much all of their options... i am used to hearing "I have a 100 gram snake in an 80 gallon aquarium and it won't eat..."
I have heard of people re-homing the animal temporarily to see if another environment all together would work. Problem with that is a snake off food is always a red flag to people with large collections... I'm not implying the animal is sick at all.. Sounds like she is just very high maintenance..