I didn't see this post! Yes, I have dealt with this before. I have a doe right now that I'm trying to work on.
The symptoms I've experienced is the doe acting very bucky when another doe comes into heat. My doe, Mariposa, has kidded for me before, but not in 2 years. Even though she lived with a buck for over 2 mos, I couldn't get her bred and she would just chase and torture tjhe other does in heat.
My vet prescribed 3/4 cc of Cystorelin, which will make the encysted follicle erupt, then 10 days later I gave her Lutalyse to make her come in heat.
I don't know which drug your vet use, do you? I would assume he didn't use the Lutalyse as that would cause her to abort, but I don't know about the Cystorelin. After I treated the doe, we hand bred her, so as soon as we are six weeks out, I'll send in for a blood test and let you know!