Hi,
i have a step daughter and I have bipolar with aggression at times.I have my own son also who is the same age as her.I do get in bad moods sometimes and would never even yell at her if I was angry.Luckily I have a great partner and if I am feeling aggressive or angry I will go for a walk or sit in my room and watch television until I am feeling happier as I prefer the kids not to see me if I am in a manic or even depressed mood.If you have concerns about her step mum just ask your child the questions you want to know or confront the woman with bipolar about your concerns for you child (i would not be upset if my step daughters mother confronted me I would feel great that she was concerned for her girl as all bipolar symptoms can be different).I worry very much about my step daughter and her own mother who has no mental illness at all.If nothing else I know I do a great job with the kids its usually my partner or another adult that upsets me or something that has happened never usually the kids.If the kids do something that is very naughty or I feel annoyed I will let my partner take control of the situation.My step daughter always asks can she stay here on school holidays (her father is at work) so I cant be that bad lol.I think it is because we share ineterests she loves to paint and cook etc with me which is something that she does not do with her own mum.But remember your child comes first and do what you think is best if you are worried.Good luck