Of course, it also depends on her age. If she's fairly young (20s-early 30s) she's got a good chance of making it to Master parent before she's 50. I don't much like my villagers being "unproductive" so if she's over 50 and still a parent all she'll do is run around distracting the male villagers from their tasks, without producing any babies. Only those very close to being a master get to stay a parent over the age of 50.

That's just me, though.