Baby forward of center, udder nicely developed, so it's just a matter of her choosing the time to see that little one. Without seeing her elongation, I'd be watching her extremely closely, as she could go quickly. Watch for personality changes, rolling baby into position even more, yawning, butt pushing, cow patties.... the whole gambit. And watch for vulva color changes. Right now it's just a matter of time.... she could go quickly or hold out a bit.
Just part of these frustrating mares, but she's looking just perfect and in good condition to go!