Nip it in the bud!
No good can come of it. It might be totally innocent on her part or intentional, but that’s not good either. The point is that you’re DEFINITELY feeling something inappropriate for her (inappropriate because she’s married) so make sure that gets shut down hard and fast before anything else has a chance to develop.
I know the flirting is fun and feeds your crush and it’s all feeling mostly harmless right now, but you’re also giving it room to grow, allowing potential, which is dangerous. You do not want that kind of mess. Not ever.