How about some ladies of rock and rock. First, a flash in the pan from 1980..
Cherie and Marie Currie rose in the era of Suzi Quatro and Joan Jett (Cherie Currie played with Jett in the Runaways) but this was their only real hit together.
Toning down a bit, here's the "other chick" in Fleetwood Mac:
It's amazing Christine McVie survived as long as she did surrounded by those massive egos but she held her own musically.