If we are talking about water retention from something, i.e. water retention all over the body, ok that's one thing. Swollen abdomen - i.e. gas or something not right in the gastric process? That sounds like something different... Have you tried anything like a digestive enzyme or any of that? On a strict diet all sorts of things can throw digestion off so.... that's just my thought. If she's stopped the winny, its a fairly short half life so it should clear any sides very quickly...