Control her head with grappling, where the head goes the body will follow. Both hands up over her shoulders and cradle her head in your hands . Try and pull her in close to your body to move her around.
When you get on top try and use your body weight to control her. Kind of resting on her while she struggles to get you off of her .
I'd love to know the full list of rules for this match to offer better advice.
If your starting standing a good solid take down May give her a shock and let her know she is in for a fight