My assumption is you are referring to real wrestling and not prefessional performances. A mat girl or mat maid can also be referred to (and possibly more politically correct now days) as a team...
Yes. At the Olympic Games, there are four weight classes for women in freestyle wrestling.
Yes because if you watch wwe wrestling there are girl wrestlers too they are called divas.
it doesn't really matter what gender you are because they will not make you fight a different gender because it would be unfair so if your interested go for it its a good sport and it keeps you fit!