My 12 year old is challenging at the best of times. This week she said she felt really ill(she's not often ill and doesn't like missing school)so I said she could stay home. I had to go to work but kept in contact by phone. However, mum's instinct kicked in and i left work early. I came home to find her sitting with a 16 year old boy.It transpires that he wants her as his girlfriend. I grounded her but on Saturday she ran out of the house. I sent the police to go and fetch her home. She swears at me and is generally disrespectful. She cant see the prob with having an older boyfriend. I have lost the will to live with herand just cant talk to her as it always ends up in a screaming match. Any advice please?