Ninj
Where art thou, MKX Skarlet?
I guess I wasn't as clear as I thought. My strategy says this:I don't understand. If you block U4, Mileena has massive frame advantage. Unless you meant crouch blocking, and you see her do the kick and then you go for a cross up jk?
Bait Mileena into the U4. Mileena players will more often than not do 2 U4 kicks in a row because they believe at the moment of input on the 2nd kick that their first one has already hit (remember, crouch blocking baits U4 up close). Even the best Mileena players I've fought need to learn to adapt to this strategy, and most of them aren't sure what to do if they manage to avoid the crossover-JK.
So to answer you, BBB, whether or not Mileena has frame advantage on this move is a moot point. The bait induces 2 U4's in a row, guaranteeing a successful crossover-JK.