She stated that they haven't started MT yet, so I don't think it's a Leg Kick. Besides, if I remember right, the OP is currently in TKD so they are probably using a kick to her body to open.
To the OP: What type of technique are we talking about here? Let me know what you're dealing with, and I might be able to suggest something. Further, you can check this thread here
to see if it helps any.
It doesn't matter if you agree or disagree
... As long as I don't bore you and I spark a moment of thought, my goal is achieved
Queng leon queng tigre ecu tacacut, queca pa? - Pampangan Mandarigma Motto