Sister is having a Crystal/Rainbow baby. Any advice?

My sister is 38 and has 2 nearly full grown sons. She has been wanting a daughter for a long time and has finally successfully become pregnant after many failed tries. Although its sex has not been confirmed, she is attaching on the idea that it will be a girl and everyone else predicts so as well. I know I should not worry, but she is also very verbally abusive and has explosive anger which she has inherited from my father. I am certain she will ruin that child's self esteem, as she has with mine (I have finally managed to heal and repair the pain that was left from my childhood and teen years).

Here's my question, can anyone give me any advice or suggestions with mentoring a child in a spiritual manner? I will not be forceful,of course. I just want be to someone who can give them spiritual advice that would have been immense help when I was a child.