I don't really want to postpone law school itself, but is it possible to postpone starting your career even after you've graduated? Or is it career suicide to take a few years off after law school before getting experience?
Yeah, I think it would be career suicide to take time off immediately after getting your degree. Women already suffer from the stigma that they can't be as loyal to their employer as men can because they'll just eventually leave when they have kids. If you held off going into practice, firms may think that you didn't take your degree seriously or aren't that dedicated to a career in law.
Then again, I think it's bad for ANYONE to take time off between law school and going into practice. It wouldn't be an unfounded assumption for future employers that your skills have gotten stale or you have lost some of the knowledge that you got in law school.