They had an interview where she mentioned how weird it was that Paul Rudd had his face in her crotch. That sounds like a newbie's reaction to Brazilian Jiu-Jitsu. I know it takes a few classes to get over the "this is so weird" feeling from it.
I think she's just stage combat. Learns just enough for the scene.
"The plastic tips at the end of shoelaces are called aglets. Their true purpose is sinister."