Mu is easy for Plat, So easy that half the time the match up is in your favor.
You pretty much AA he with 2B.
You IB SoD, 6C, and 2C and you have a answer for a lot of her stuff.
She is also free to heart cars more than any other character in my experience.
She tries to 6C>stein you get a heart car, hell she does anything that is basic Mu shit and Plat can kill her.
The problem is when she locks you down and you don't know what to look for.