I would simply ignore her.
If it gets really bad then of course defend yourself.
But my personal advice. Don't. Give. Her. The. Luxury. Of. Embarrassing. You.
She wants to annoy you and make you yell so if you ignore her she will slowly shirk like this
HiHiHiHiHihiHiHiHi.
Until she leaves you alone.
Thats my personal strategy.
:D