just remember there used to be a time when momiji was WAY more annoying than she is now (pre-patch anyone?), but if you're getting hella launched by momiji, you're probably hitting buttons when ya shouldn't >_<
just block her out, she doesn't really have any scary lows and her throw options are kinda booty, on top of that her pressure is very linear, proper use of side steps and fuzzy gaurds will be your best friend vs momiji
Momiji is super difficult to use, and has to rely on expert reads to properly bait and zone her opponents with her unfavorable hitboxes and useless lows. Unlike most characters who have more NH launchers than CH launchers, Momiji's launchers are terrible, and require full threshold to net any damage.