ah ok ill give it a go thanks :)If so, then what you must be talking about is her iFC3BB, which means Instant Full Crouch.
Basically, Instant Full Crouch is when you quickly crouch to perform the full crouch move of your choice.
This is done by manually crouching (G2) and performing the move as normal.
Read more about it here:
http://8wayrun.com/threads/advanced-techniques.4885/
It's only one frame slower than done from crouch, so it may seem like the CPU was doing it from standing.