Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner. If you would still like assistance, can you tell me:
How long has Gurty been scouring? What does it look like?
Does she just seem weak when she walks?
Or does she have a head tilt, circling, or rapid eye movements?
Any access to toxins (ie plants, chemicals, heavy metals, etc)?
Any chance of head trauma or injury?