DD1 has always been a 'thinker' and a sensitive soul. She is generally happy and has a settled family life with no recent trauma/ bereavements etc. Just recently she has become a little moody - nothing drastic, but a noticeable change. I put this down to hormonal changes.
She has very recently been talking about how she gets 'sad' at night but she's not sure why. She is telling me that her body is telling her things like she is "no good". Tonight she said she didn't know what her purpose was in life
. I explained that it would come clear in time and that the confusion is probably the result of her brain trying to keep up with her growing body. She seemed reassured by this and decided her purpose might be to help small creatures 
She has also recently developed a tic whereby she whistles involuntarily. She says her body is telling her to do it. We have largely ignored it.
I am struggling to determine a cause of this change in behaviour, and I'm wondering whether this is not unusual or whether we should be seeking help.