DD has flipped (she is 16 almost 17) because I have opened her post. Yes this does look bad but a few months ago she took an OD and ended up in hospital and CAMHS told me to take sharps etc out her room and I found some letters from people she clearly doesn't know in units which is obviously why she felt the need to OD too. She got a letter through the post so I opened it and it was from a girl in a unit asking her how she was etc but I didn't tell her about it until a very heated argument last night. DD is upset with me and is acting off, was I being unreasonable or do I just care?