She is really unhappy in herself and hasn't got much confidence and shuts herself away at home but tells people that we don't want to have her with us and have her s part of the family. She is hugely jealous of her 11 year old sister and can't stand her and has now started to steal from us. She has taken £50 from us in the last few weeks. I have found the money each time and she just lies about it and doesn't even seem to care about how upset I am. I am at a loss as to what to do