How Can I Check my Daughter's Email?

My daughter has been behaving very strangely recently, and I'd like to check her e-mail account. I'm her mom and I've tried to talk to her about this but she won't say a thing about it.
I'm scared she is taking drugs.
Is there a way I can access her account? Do I need her password?

I understand your worries but her e-mail account is private and you shouldn't check it without her permission.
Try to talk to her about it.
If you really want to read all her e-mail messages you will need her username and password.
If you don't have this information I'm afraid there's nothing you can do.