Big is Beautiful!
if she hasn't pooped since her last two feedings/when u took the last pix, she will loose mass/weight after she does go to the bathroom next. so her current size is misleading until u can get her empty weight and a visual.
unless she is severely malnourished, which she doesn't look to be, she will have waste. one way to tell is to just lift up her tail and look for the sausage butt.