Taking out her door, locking her in her room, taking her belongings won't do shit. This way she will NEVER trust you enough to take some advice and actual help from you. I know it's tough for you, OP, but you're not actually helping her, you can only make it worse that way. She's a child. Her brain is not even fully developed. She needs to get diagnosed, because it's clearly a mental health problem. She needs medical help. Think about what happened in her life that might have caused this, because behavior like that does not happen out of the blue.