If she were my mare (very pretty by the way) I would want to know by this point in her possible pregnancy if she is indeed pregnant. If she is, you need to be watching her 24/7, and not every hour or every 15 minutes but ALL THE TIME. Our maiden mare this year did not get a belly at all, but ours DID make an udder a few weeks before foaling and she even waxed, which our other mares DID NOT do. Maidens can be very tricky. I would either get a Wee Foal 120 test done on her ASAP or get a vet out to check her. We had a false pregnancy once where the mare actually DID make a bag right on schedule (she had been U/S in foal early on) and then stopped all progress. Vet was able to do an external ultrasound and confirm there was no foal in there and we were able to get some sleep again. Good luck!