Mileena has to play just as safe as Cyber, since she cannot roll or teleport in fear of getting U4xxSpecial or 34,B22xxSlide'd on every time.
With that said, you just took off her wakeup options, as even her ExTele you can just parry in between.
So, all you have to worry about is her zoning and up close game. While I cannot speak for her close range game because that is something I'm not entirely familar with at a high level like Pig's, her zoning is like anyone else's, use Cyber's damn good dash to get in at least half screen, dive kick on reaction, or close in.
Personally, I find it best to condition a Mileena to never want to wakeup in a million years in fear of getting dunked on, and once that conditioning is there, start the pressure game.
Also, don't randomly divekick. I know that seems obvious, but really, Mileena can roll punish that every time, it sucks, I know.