Fighting another chick

Yesterday Diane started grappling again.  She is pretty tough.  I also found out that she outweighs me by 32 pounds.  Gotta start lifting again.  The problem is that the grappling seriously tires me out.  Wish I could find someone to do open training on Saturday mornings.  I hate losing, and since Diane is 10 years younger and her boyfriend has been grappling since he was a kid, it is a strong possibility that if I don't keep myself at the top of my game, I'm gonna lose.  Not good.