If she didn't want the kid, she could have gotten an abortion, most likely without her parents knowing. I find it hard to believe this girl didn't know she was pregnant. I know some women have few, subtle, or no symptoms when they're pregnant and may not know they are so until late in the pregnancy...but I don't buy the whole "Oh, I just didn't feel right one night" and a baby popped out.
That girl's parents must not be too observant of their own damn daughter if they didn't catch on that she was pregnant. Unless the girl was a bit on the large side before getting pregnant, how could anyone miss her belly growing?
I also hope she is unable to have her own kids. If she goes to jail, maybe Big Momma and her cronies will beat the little murderess to the point where her uterus lay in oblivion.