The photo of Francine and the flies made me chuckle! I assume you feed her more than just FF's. And looking at your new pics, I'd still have to say she isn't gravid. I've found that the females of that whole family, particularly the rudis, put on weight almost immediately after mating even though they don't give birth until many months later. I remember when you got her and again I think she should be bigger if she was gravid.
Stranger things have happened though...
Cheers,
t