This was done a while back. I recall that we have one girl, but she isn't very active (and I don't think she has a cabinet). You can't rely on the results of a gender poll in a historically male community because some people will lie.
I only know of one girl in the larger arcade collecting community (counting, people I know in real life, klov members, and RGVAC members) and that is Jetgirl in California, she has Frogger, Burgertime, Bump N Jump and DK Jr.
This really is a male hobby. Girls love to play, but few seem to want to own or build their own.