She doesn't look pregnant (at least not in the latter stages pregnant) and the fact you can express something out of her teats doesn't necessarily mean she's lactating, or I suppose I should say lactating for a foal. I had a mare who would see a foal and immediately bag up. Not a real common occurrence. I'd have the vet check hormone levels and see if anything is out of whack, and of course, rule out a pregnancy because just the way you phrase some of the stuff the seller told you, makes me wonder. And I've been appalled at the number of open mares that I've seen sold this year that turned out not to be open after all. Does nobody pay attention to what's running their pastures or preg check their mares after having them covered anymore? A friend of mine bought a real nice Trak mare for her daughter last fall. Mare was not bred (per seller). Guess what, she had a colt a month ago. There went the daughter's show season.