Hi G... I would be tempted to get her ovaries scanned to see what is going on in there. It could be that there is something a bit unusual happening which can be very easily treated

Worried1's gorgeous girl Diva had her ovaries scanned and had one smaller than another (I think... could be worth PMing her as there were a few tests done).
Fingers crossed you can get to the bottom of it but it sounds as though the Regumate is working if she is better to ride