Copying is one of the most sincere forms of flattery. It sounds like your sister is struggling with self-esteem and self-identity, so is taking on board that of the people she admires around her.
Doing so to extremes of harming though is not good and does need looking into. Can you quietly take your Mum aside and explain what is happening and that you are worried for your sister. It may be that she needs to speak to a Dr. It may also be that this is part of why she is seeing the counsellor?
My advice would be to praise her when she does things that are individual - and yes, that praise should be in the form of positive attention. Then, when doing things that copy you, provide less of that affirmation. She will eventually pick up that copying others does not necessarily provide the affirmation of self she is seeking.
Be gentle with yourself.
Roiben x
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