Typically the girls I'm met who play paintball tend to be petite, which is an advantage. They hide better and are much smaller targets. I knew one girl who shot her own boyfriend in the groin knowing full well he didn't have a cup on. On the brighter side she said she would kiss it and make it better after the game so I'm not sure if he was a lucky guy or not.
The only time I've found women to be a disadvantage, and this is more of a size thing than a gender issue, is penetrating dense brush. I got stuck behind a woman once when she couldn't bull her way through the undergrowth. But that was easily rectified bu my taking point.
We did use thier size to advantage once when I charge a bunker and was hit repeatedly. The two girls with me were following close behind and avoided getting hit, splitting off to either side once we reached the bunker. Exacting revenge upon those that tagged me out.