Dont sweat it. Her combos changed a little and you just picked her up.
This footage might help you out. There getting used to her new combos.
http://www.twitch.tv/adastream/b/345973036
Mu-12 gameplay starts at 1:18:00 and last for 42 mins when the stream ends.
Edit: The actual matches are u-12 vs bullet, azreal, mu-12 mirror, v-13, and bang i believe.
Everything else in between is training mode i believe.
Bullet@ 1:23:45
Azrael@1:36:45-1:51:52
U-12 mirror@ 1:52:30 Astral finish
v-13@ 1:55:16
Bang @ 1:58:04
Azrael seems interesting since his reversal can be used for absorbing our projectiles.
He also throw a projectile back at us after absorbing them.
He can confirm his projectile into his distortion.
It will whiff if he is full screen.
You can also CH Azrael if you hit him before he ends the dp portal move or whatever it is.