lake My niece is terrible. She is 2 1/2 years old, which most call the terrible 2's.?

You have every right to want to have a nice house and keep your things looking nice. Shame on her mother for not parenting that little girl. It's the parent's responsibility to teach manners and if she's to be in your house, set some ground rules with the little girl in front of her mother so that she understands what you're asking for. If she continues misbehaving, tell her mother that it has to be controlled.there