I always thought that Celia completed the Seattle run of Piazza and was then replaced by Kelli O'Hara for the next incarnation, which I think was Broadway, but I can't remember now. If Celia already had Broadway in her contract, then I suppose it was a firing. But if not, it's more like she wasn't invited to continue. I very much doubt she chose another show. I think she was no longer going to be involved with Piazza, THEN Spelling Bee became an option. And she was wonderful in that.