So, now that the game is out, we can finally test her buffs out!
66K Tenfu on block will give you from +1 ~ +4. The faster you do the teleport the more advantage you get. Against Kasumi's P, I believe that +3 and +4 will beat her out if you do Tenfu P. So I'm just gonna assume that you're getting +4 with what I'm about to say. Also, all tested on Kasumi and Hayabusa.
Tenfu P - beats out P, 3P, and 2P (so everything)
Tenfu K - jumps over P (i9 P ONLY) and 2P loses to P (i10 AND ABOVE) and 3P
Doing nothing will be interrupted. I'd do Tenfu P to start her stun game and I'd do Tenfu K to get guaranteed damage with the combo Tenfu K Chifu K Tenfu K Chifu P. Don't forget that instead of attacking they can hold or block. Use empty teleport into 46T or 236T to keep them on their toes.
46T looks like Kasumi's 46T except she teleports when she grabs their arm and comes back to hit them in the gut. It gives her +10 but you can't connect P because of the pushback. At the wall, P gets blocked even though it's i9.