Thank you Fæ for your experiences (especially the cautionary tale told by the first one). I would like to also offer a more theoretical caveat, to wit that any sort of "women-only" space within the Wikimedia framework may with even the best of intentions backfire, or at least fail to meet its goal of supporting those female or female-identifying editors who feel the need for it.
To wit: there is a rather large percentage of women, not a majority but at least a third, maybe even over 40 percent according to some studies*, who actively avoid taking part socially in organizations likely to be dominated by other women, or even informal such "taco fest" situations like, say, hanging out at the pick-up/drop-off spot outside a school (at least in the US; I'm sure that readers from other countries will be aware of more apt analogies in their own cultures, if they exist). We need not go into the reasons at this time.
But I suspect that that group of women probably accounts for a large share of the women who _do_ edit Wikipedia regularly and successfully. So a women-only space may ironically see far less use than expected, and accomplish little of what might be hoped.
Daniel Case
*Deborah Tannen alludes to these in some of her books, and the decidedly non-academic "The Twisted Sisterhood" is devoted entirely to this.