My stepdaughter treated me like dirt for years. Verbal abuse, theft, vandalism, assault...all with the expectation that I'd love her unconditionally. This girl wasn't abused, unless you consider spoiling without disciplining to be abuse. She wasn't given enough limits or consequences.
My attitude changed when she deliberately injured my back as a special "birthday present hug." She insisted on hanging her 120 pounds off my neck. I told her that I already had a herniated disk, and that her weight would make it worse. I said NO firmly. She did it anyway. The look on her face said she knew exactly what she was doing. My back took a long time to recover from that further injury. Meanwhile, she continued her abusive behavior.
I was so PO'd I sprinkled tiny amounts of my pee on her comb, hairbrush, and toothbrush. It was like voodoo. Soon I was able to set limits. She backed off, certain that I'd follow through on my promise of filing a police report if she ever assaulted me again. My husband started setting limits with her too. She's now downgraded from full-blown monster to well-mannered narcissist.