As I mentioned in the question, I suspect that this question was closed more because people disliked the premise and/or subject matter... More or less a case of "I dislike this so much I'll downvote and vote to close"
And it was pretty easy for them to justify closing it as too story based, due to the original wording.
Honestly my thought was that the premise was fabricated just to ask a question about maternal instincts... The whole "baby females" thing seemed underdeveloped. How did they survive to maturity without observing some basic things about procreation in the natural world around them? But that seemed more or less immaterial to the question, just a reason that these women didn't know anything about pregnancy or birth etc. But that's a pretty huge handwave, and many users were probably skeptical about it.
Beyond that I suspect that some users were probably unsettled about the subject matter. Anytime you're talking about sex, gender and/or procreation some people are going to get a little more sensitive. I'm sure that it wasn't your intention to stir those sensitivities, but it's good to be aware of how people may be reading into your motives.
When you say things like:
"What might this uninformed female think of that weird stuff that just crept out of her"
It sets a certain tone... It gives people who are already feeling a little suspicious about your personal motives for asking about a charged subject more of a reason to feel suspicious. Your question and your story touch on some hot button issues. I'm certainly not trying to tell you not to talk about hot button issues, just be aware of how you do it and be aware of how people may react.