I want to make a girl tap out in an mma fight
Why do you want to make her tap out?
She's too much for me to handle.
I understand that you feel that she's very good, so you want to win. In order to do that you need to practice and train very hard.
She won't be an issue anymore if I win so it won't hurt.
I'm sure if you study how she fights, and you train a lot, then you'll have good chance to win. Then you can move on to even more difficult challengers.