I just had a child pick up a rock and it dissapered half way to the tech table.She had it one second next it was gone.It didn't show up in the rocks either.Whats up with that.I needed that rock and the points.

That child is 17 now and dont do anything.There are no dislikes on her screen.Just a brat I guess

Some villagers are difficult to train (just like in real life). If you're persistent, you should be able to train her at a skill.