It is a terrible idea to fly in on a blocked or whiff chain, imo.
Mu is a match that requires patience from my experience. A good Mu will never throw out a stein without knocking you down/blowing you away first, and her DP is pretty lol. I've had my 5A/5C clash with it.
Her 2C is a good antiair, imo, most of the Mu's I fight go for 3C ( knockdown ) into Mu loop or stein setup, I'd tell you to watch out for that, but her overhead is kinda misleading as well.
You can catch her setting up stein/laser super with Mizuchi, if that helps.
It's a weird matchup, haha.