I don't want to put this in Relationships incase she sees it. We have always been close but our relationship can be very strained at times. She is 18 months older than me and has always played the role of the elder sister. I am quite happy to let her take charge most of the time. She has many great qualities, is very kind and caring and has been a great help to me in raising my DC. But she can be very difficult to get along with. She is quite controlling, always thinks she knows best, gives lectures etc. I usually ignore, bite my lip, pretend to agree - I try to appease her. She has now gone NC with me over something I suggested. I was trying to help her - she obviously didn't like my suggestion and hasn't contacted me since. She won't be spending anytime with us over Christmas. I'm totally frustrated with her. She has gone NC with me before over the years but on this occasion the reason is such a non-issue I'm beginning to think she has some kind of personality disorder or mental health issue. She takes offence very easily and can hold a grudge forever. I think she must resent me terribly and its a case of the straw that broke the camel's back for her. Any advice would be very welcome. I can't stop thinking about it. Should I just let her be or should I keep trying to reach out to her ?