It works now! Well, there is a definite bulge there, but my gelding currently has a similar bulge after a week of grass and no work...what does your vet say? Is she meant to be preggers?
My shetland mare looked tons worse than that! I swore I could even see something moving in there! Thing was, she was a rescue and her last few weeks at her previous halfway house meant she could have been in contact with a stallion, so the possibility made her belly look even more foal-not-fat. Blood test - not preggers! Fat-not-foal after all! Could your mare have had access to a stallion? She doesn't look particularly pregnant to me but if there is a possibililty, get a blood test done x