Hi Aviza.

I think that your daughter at 16 is simply trying to find her place in the world. Many young teenagers have a tough time of things trying on new faces, wrestling with beliefs and their own ideas of the world, testing boundaries, coping with peer pressure and exploring/defining their sexuality...not to mention choosing career paths and the added pressure with study obligations. Most certainly some of her behaviour would be of concern if she was acting out and putting herself or others in danger, but from what you have written, sounds like typical rebellious teenage stuff.

I would suggest giving her a wide berth, whilst keeping an eye on her moods and keeping an open dialogue...not only about the negative , but also positive things that are going on in her life right now. Positive reinforcement is so important at this age.