Already the rumours are going that Michelle is already pregnant. Afterall the 80 days have passed and so she could be as far along as 6 weeks. A few bloggers were saying she looked a bit thick around the middle--is she alrady pregnant? I doubt it.
Remember how much milk she's been producing non-stop for Josie? She has to keep fueling her body to produce all of that. So instead of sticking to her usual post-baby weight watchers plan, she's increasing her fluids and protein. While she may not be gaining any weight, she certainly hasn't had a chance to lose any of her pregnancy pounds yet.
She also mentioned a few episodes ago that Jim Bob was back to his usual stress eating--gaining back a lot of the weight he lost from his recent foray into weight watchers. I wouldn't doubt that Michelle has probably joined him in some stress eating as well. Who of us wouldn't? Add to that the strange home, the inconvenient kitchen meaning they are probably eating quickie meals that aren't as healthy as they could be. And most people don't think they eat healthy to begin with.
Frankly I think she just hasn't lost the baby weight and is packing on some extra with the stress and emotion and the need to add calories for the milk production.