Sorry I totally missed this question D: My bad Kiba.
It's pretty much the Hammer loop after she hits you with Mystic Momo, if she has hammer next on her item list (CH 214D with a Melee Item) she can either use CDT finisher for about 6k ish damage, or just go for oki and get a crapton of meter (about 60%). Either way, it's really bad for Tsubaki.
but as far as this match goes, Tsubaki has plenty of tools to lock down Plat in the corner and make her helpless. Like the Ragna match-up, a good, smart, neutral offense can make Plat crumble.