f+2,2,u+4 and it's post guessing game is always unsafe, as far as I know. Delay or quick Float and land is always unsafe. They can either knock you out of the air or trip guard you as you land. Doing an air fan is always unsafe. Air fan in general is extremely negative on block. If you njp they can trip guard(though it's harder than Injustice). If you do RS ass away it's super easy to run to her and punish.
The thing is it'll be hard for them if not impossible in some matchups to punish all the options all the time if you're mixing it up. Characters with fast advancing moves will have an easier time. I'm not sure how this meta plays out in all the matchups. It'll be interesting. Ultimately you could just keep it at f+2,2 and then hit confirm into lift or block confirm into ground fan, which will probably be safe against most characters. I've been trying to do that against Johnny Cage, since his f+3 is so good at blowing up the f+2,2,u+4 stuff.
Unfortunately it kind of sucks she has to play a guessing game like this after her core normal footsies tool is blocked. When you compare her f+2 with the footsies of other characters it makes me emo. OTOH the string looks very pretty.
