12yr old girls behaviour

[Gran0f2]

My Twelve year old Granddaughter has completely changed when her brother was born 5 years ago when she was 7yrs. She is so moody and I believe very jealous of him things happen which she says is an accident but her parents think she does it on purpose.  An incident this morning:- She shut the door on him and caught him with it so when they arrived at my house to drop him off she was extremely upset. She said that it was the same as what happened the day before when her Mum shut the door on her not realising she was behind her. My daughter said it was not like that and that she had done it on purpose - what to believe she is only a child !!  She also answers back (which all kids of her age do including my daughter) and is very very moody.  There really is no reason for this as she loves Horses and goes riding twice weekly, when she behaves she can have her friend to sleep over but once this has been arranged my daughter says her attitude gets bad again. Please, please help as it is really getting me down I hate to see my princess so upset but at the same time I know she has to behave and be chastised.

[Sandman2]

    Thank you.  Just being curious - how is she doing in school?

[Gran0f2]

thank you all, I was just desperate for an answer not sure about ADHD mistake.  She won't do her brother any real harm as she does love him and I do believe that she doesn't mean to do these things she just does not think.  

[Sandman2]

   May I ask why you are posting in a ADHD forum?  Did you land here by mistake or is this something that she has.  Because if she does have ADHD, it does change how these things are handled to some extent.

[kirk8]

I don't think he behavior is abnormal for her age.  She needs discipline and structure.

[MarkLakewood3367]

It sounds like your granddaughter is having difficulty emotionally adjusting to the birth of her brother.  This type of family change is not easy for kids to adjust to, especially if they never needed to share their parents with siblings.  

My recommendation would be to have her speak to the school counselor or have her evaluated by a mental health professional.  At the moment, my concern is for the safety of her brother.  The therapist would be able to help her explore her feelings relative to her brother and in turn, over time, improve her mood and overall conduct.