Did you start giving her rice instead of her food? Nothing stops them up like rice.
I don't know if you guys remember, but our dogs used to be like that regularly and the vets couldn't figure out what it was. Changed their food to expensive "organic" shit, they'd be fine for a week, then they exploded. Changed them to crappy Iam's for sensitive stomachs and it immediately went away.
So... What kind of food are you feeding her?