I believe her parents would have accepted and loved them. I don't buy the religious aspect.
Why not? That seems totally plausible to me.
Of course it doesn't excuse it, but none of us has any idea what she was brought up to believe about having sex before marriage, having kids out of wedlock, etc.
Honestly, I've seen it firsthand. Not to the extent of someone killing their children, but maybe the girls I knew weren't brought up in the same circumstances as this girl? No one knows, that's the point.
But I've seen girls that were brought up in an extremely conservative household, where they were absolutely terrified to tell their parents (usually the dad) that they were pregnant, so they hid the pregnancy until they couldn't anymore. In one case, a girl didn't tell her parents until she actually had the baby. In another case, a girl felt more comfortable going through with an abortion, rather than fessing up to her ridiculously conservative family.
So let's not pretend that it isn't possible that she was taught to believe that women that have children out of wedlock, or without a father, would be an embarrassment to the family, or would end up in hell, or whatever.
And again, it doesn't excuse it in the least bit. She did a terrible, reprehensible thing. But it is still a terrible, terrible thing, that we don't know the details behind it. We don't know what kind of world this girl was living in.
I know it is very easy for everyone just to immediately jump to the conclusion that this girl is evil, and that's all there is to it. But we don't live in a black and white world, and nothing is as simple as it appears to be.