1- iAF hits him out of the roll if done correctly.
2- Use her invincible wakeup moves to keep him from pressuring you (Pretty Kick, :en Pretty Kick, :en Fan Lift, Square Boost, :en Square Boost, and :en Fan Cutter are all invincible wakeup moves), it will make them think about their approach when they knock you down. Kitana is not without options. She can simply block on wakeup, imagine that.
3- Just block, if he spins, he dies. Don't panic against Kung Lao, if they smell your fear, they will pounce. Wait for the right opportunity to Square Boost out of the corner.
You can block it, then hit him before he does it again. You can d1, uppercut, :en Fan Lift, or even jump out before he can do the string again.
This is the most asked question I get when helping people out... they ask me "How do I get out of Liu Kang's infinte?" LOL!