6 year old girl being malicious to toddler

[MelBail]

My 6 year step daughter has been getting more and more violent when playing with her younger brother, who is 14 months old. I always keep a very close eye on them playing together, because I have always caught her not being very nice to him. Just last night though it escalated dangerously (in my opinion)... I heard my son around the corner whimpering or something, so I went in to check on them playing and I found her covering his head with a blanket saying 'Shh it's ok...' I didn't freak out like would be second nature to do. I just firmly questioned what she was doing. She claimed 'I was trying to give him flowery hair with the blanket. And I was telling him it was ok if he wanted to take it off.' *Note: flowery hair because the blanket is flowery. So she was saying she was trying to make it look like the blanket was his hair. But the blanket was covering his whole head, face and all.* I am baffled. I am extremely frightened for my young son, but at the same time I do not want to shun my SD into a corner.

It has been getting increasingly more dangerous like this, which is why I keep a very close ear and eye on them playing together. Then this morning, my son was playing on his zebra riding toy and fell off. Usually this toy is in the middle of the room, but this time it was pushed up to the heater and when he fell he hit his head on the heater and was stuck with his legs and head in the air (folding him in half). He could barely cry let alone breathe. Hubby and I were in the kitchen fixing breakfast when we heard a sort of metal thump and both went running. When we got in their room, we found him in that position, and SD was across the room sitting on the floor staring at him and snickering. Like it was funny!! Needless to say, hubby flipped out and began yelling at her. No swearing, just loud yelling about 'Why would you laugh instead of helping him or coming to get us?' etc. She then got a very long time out so that hubby and I could cool down and take care of the baby's head.

A little later, we asked her why again, and her response was 'Because last night I had a bad dream and couldn't sleep well...' etc etc. I dont think this is the case, mainly because I heard her snoring all night on the monitor. And no sleep talking like her and her dad do. (That's when you can tell they aren't sleeping well). Oh and I almost forgot to mention, yes they share a bedroom because we can only afford a 2 bedroom right now, but they have always shared and there were no problems like this before. We also have another baby due in April (girl this time).

I would appreciate any advice. I just cannot seem to get her under control. We have her on a waiting list for psychiatric evaluation, but we have no idea when that will be.

[margypops]

Supervision at all times probably your step daughter has some jealousy issues, so keep the 14 month old with you, Focus on her positive side so she doesnt feel left out and as you have another Baby coming she will act the same , so let Dad and you give her more attention and get her playing sports and games and outside activities,weather permitting, she probably  sees the younger one getting more attention, give her some one to one time aswell. make sure Dad is well involved.