Huh, that really is strange though she looks pretty fit from the first image. How does she feel? Can you easily feel other bones like her spine, does she feel under muscled and flabby?
If you could take more pictures with he more stretched out, maybe a belly shot, that might give people a better idea of what's going on here. I don't think she looks particularly gravid, early stages maybe, but it's hard to tell from that position.