I would keep pairing. Girls do not always go every year, no one really knows why. I have a beautiful mojave girl that I REALLY want to go, but it's not looking too good. She was locked with my mojo boy just yesterday, but I think it is a lost cause, I don't really feel any follicles.
I'm sure the ones that are not going to go will start eating pretty soon and I'll quit pairing them up and wait for next fall....
Hope that helps!!