I dunno about a handful of electronic artists being women. Some of the most influential electronic bands from Laika to Crystal Castles to the Knife, Royksop, Fever Ray, Air, Massive Attack, Thievery Corporation, feature women. Since you mentioned ambient listen to Juana Molina.
House and trance also feature tons and tons of woman vocalists...
Female DJs and producers, are another matter but they're out there.
Nina Kraviz is the most controversial at the moment, due to a video on RA where she's sitting in a bathtub. I like some of her songs though namely "I'm Gonna Get You". In the realm of minimal and tech house, there's Magda, Kate Simko, Heidi, Dinky (not to be confused with Dinka, a Swiss progressive house producer), and Ellen Allien. DJ Rap used to be a big name in jungle/D&B in the 90's but I'm not sure whatever happened to her.