Great pictures - she looks so well! I think you have two possibilities, one is that she IS in foal but the birth is some way off yet, and the second is that, now we know that she is older than you first thought, she has foaled in the past and what you are seeing now is a brood mare's tummy which has become more obvious as her condition has improved!
But 'something' is happening to her tummy, so lets hope it is a baby that she is cooking in there!
But 'something' is happening to her tummy, so lets hope it is a baby that she is cooking in there!