See, I think guys who outweigh her by 100+ should be able to take her - easily.
Assuming you are 235+ with more muscle than fat, I will assume you are a decent athlete - not world class, but enough to be able to use your athleticism and weight to take on an undersized woman. You overestimate the advantage she would have in close - against like sized opponents, sure she has an advantage. But with an extra 100 pounds, she won't have the same leverage she enjoys against most of us. Then, pure weight on her will wear her out as fast as you get worn out.
If you have any boxing skills, you could use your reach advantage if she does not charge you. jabs, not power punches will keep you from wearing yourself out.
But, worse case scenario is you should be able to bear hug her, and body slam her, and don't let go....