Sara Greenhilt.

And for men with a Lawful alignment, there's Roy, Durkon, Tarquin, Nale, Malack, Redcloak, Hinjo, O-Chul, Thanh, Eugene Greenhilt. Bearing in mind that there are far more male characters than female ones (and, yes, that's a problem), I don't think there's any correlation between being female and being non-Lawful (though there is, actually, one between being female and being Lawful Good if established Lawful at all).