What's gone so badly wrong?
DD#1 has changed literally overnight from a beautiful, gentle little thing into a horrible, viscious, malicious little girl. She has been so incredibly good with DD#2 until now - lots of cuddles, holding hands, stroking etc but suddenly she is so nasty. She is giving her really hard, two handed shoves. The poor little thing's head is rebounding off wood floors, door handles, coffee tables. You name it. I'm so worried she's going to do her a serious injury. And DD#1 knows she's doing the wrong thing.
Please somebody tell me what I have to do to stop this. I'm so worried about both of them - one who is obviously doing it for attention (which I thought I was giving her more of lately) and the other who is at real risk of physical harm.