Parenting advice needed: 13 yo female

[Dante84]

Just take a sharpie and color over the camera when she leaves it laying around.

Honestly, though, kids can pick up on sincerity and will respond to the honest communication more than bringing the hammer down. Once you explain what is wrong and what is okay, and make boundaries clear, she will know what will fly and what won't.

If she violates these boundaries, punishment is necessary. Sounds like she doesn't know the boundaries yet, though. So coming down hard on her won't accomplish anything positive, it will just confuse and anger her.