My daughter is being very secretive?

shes acting like a teen but as a mom you need to lay down the law. Don't let her be on the phone after a certain hour. If you feel she may be in danger then yes, check up on her, but you can't nit pick on everything you see. Also don't let her go if you don't know who she's with. What if she's meeting 20 year old guys and riding around at fast speeds on the motorcycles and making out with them.