Honestly, I'd be more than shocked if FP was considered to be nerfed due to her KCs. Her level 1 is pretty darn hard to land without one or the assist of another. Her Level 2 IS good-ish, but the startup time, recovery between dashes make it not as good as people think (also certain maps just make it plain useless). Her Level 3 is not worth saving up for at all, probably the worst in the game.
And for the people that cry nerf on FP's minions: take/nerf that away and ranged characters will have a FIELD day with her.
I think I've come to terms that with her she becomes a little too reliant on those KCs. She really can't combo in the air like majority of the cast, doing only one hit or a twirl at most. She's weak to corners/edges (super-wise, I've been right on top of someone, only to fail a Level 1 because she instantly goes into her missing cake animation), platforms can ruin combos/set-ups, and hard to carefully meter your AP building once you're on a roll to prevent yourself from getting the Level 3 (and sometimes the Level 2).
Also players that know FP know that if you're in the air, there's really not that much she can do to you... but if you're on the ground... good luck, and blocking is your best friend (especially if you see the air sword coming, if you block it, the sword sound still goes through, and a reactionary FP can and probably will and react with the Level 1 and you'll be able to dodge it).
Just fix the Buzz! glitch if anything, other than that she's pretty balanced (in my eyes, I'm pretty sure there's some... or a lot others that don't agree to my opinion on this).