You may be right and she's just becoming a little over weight, or she could just be retaining abit of water. Or are you 100% percent its a female? I'm not trying to say you don't know your frog but the throat seems to be abit darker then a female by the looks of the picture and it almost looks like a vocal sac, but it could just be the lighting in the picture. I would really take a good look at the feet and see if there nuptial pads there. And for the fogger thing there was a guy named grabius on here and he had a fogger and everytime the fogger went off he said it excited his male for some reason and it would croak or puff up his vocal sac so he removed the fogger. I don't know if he ever put it back in but maybe this is whats going on. Again I'm not saying you don't know your frog just thought I throw that out there.