Thanks for the update. This sounds very promising, and I hope this fixes her problem.
One of my cats recently has started to do something similar. After he's pooped in his covered litter box, he charges out and runs all over the house like a wild man! I turned his littter box so that it faces into a corner, so he can't do that. Have no idea why he started it, but at least he's pooping in the box. Strange!