Just to let you know, there's about a 13% chance for 3 hets to come out of a pied x het pied pairing, so you still have a good chance she might be het pied . The most common outcome would be 1 pied and 2 hets, or 2 pieds and 1 het, and those are each a 37% chance by comparison.

Now, after 10 total eggs, its only a 0.1% chance she could still be a het, so I'd stop after that personally and try to prove out the albino