2B (low profiles her j.C,fuuuuck yeaaaaahhhhhh) j.C, 5B, 3C and pretty much bullying her with your items;Cat,Missiles and well placed bombs. Don't be scared to press buttons, sometimes you have to see what works and what doesn't (or at least that's how I play, every match is an experiment). The ordinary stein lasers do no chip. Air Persia through if she does command laser from fullscreen to rush in.If you're brave, you can time it just right and press a button for the Air Persia follow-up and hopefully they'll try to press a button and you'll get a Fatal Counter from it. Most of the time they'll want you to press a button while the laser is going offscreen so that they can convert off of it. Notice that if you're close to them when you when they launch the laser of the steins, they'll be blocking, just grab them. Not only will it nullify the incoming laser, you can send her to the corner right where you want her to be. I've done this matchup with Severin for the last couple of weeks, I'm so sick of Murakumos that I want to strangle Mori for creating them. Oh, and if you're scared of 6C, just barrier break dash throughout the battle and try to stay at least 1/2 character width from her, so that 6C will whiff and you can punish her. Just deal with 6C like Jin 2D.
EDIT: ゆめかみ is a goddamn witch.