P.G.
If she's pooping on the potty, it's possible you missed it. My son did the same thing - it took at least 4 days, maybe more. I can't really remember. But no problems. it's round and will go right through. Keep her hydrated and get as much fiber in her as possible.
We got an x-ray, and the sucker was literally right at the end of his large intestine on it's way to the exit.