So, I think my favorite female public rationalist is Byron Katie, who has a number of great rationality quotes, most of which boil down to this one (which is I think her only quote in the LW RQs):

When I argue with reality, I lose -- but only 100 percent of the time.

Close to it is one by Karen Pryor:

Nowadays many educated people treat reinforcement theory as if it were something not terribly important that they have known and understood all along. In fact most people don't understand it, or they would not behave so badly to the people around them.

Above that is Megan McArdle, and the highest quote I saw that was probably by a woman was this one (I didn't look in to whether or not that Ashley is female), and this is the highest one I saw I'm pretty confident was by a woman. (A number of them were attributed to internet callsigns, which are difficult to reliably map to sex.)

If you think that more female authors on the list would be an improvement, then find female rationalists who say things worth quoting, and then quote them.