1) As long as she follows the rules, and regulations set in the MMA, the MMA should not treat her any differently.
2)They do have an advantage, but if they have undergone surgery and hormone treatment, the advantage isn't as extreme as people believe, especially if they are small.
3)I think that they should be told before the fight, and it would probably scare me because the stereotype that men are significantly more powerful than women.
4)I think that as long as they follow the rules of the MMA, and tell opponents beforehand, things should continue on as normal.