In my experience women drop out of law, especially litigation, for several reasons, none of which have to do with being temperamentally or biologically unsuited to it.

Chief among the reasons are the interplay of these two factors:

* the widespread belief that lawyers should work punishingly long hours, and
* the widespread belief of husbands, too often conceded by wives, that women are better at raising children than men.  And yes, 'raising children' is still a time-consuming activity even with day care and nannies.