My niece gets drugged and taken advantage of in my house

A few days ago, we had a big party at our house and my niece was there. I noticed that she was acting a little strange, so I decided to keep an eye on her. I went to the kitchen to get some drinks and when I came back, I saw her sitting on the couch, looking kind of lost. I thought maybe she had too much to drink, so I decided to take her upstairs to her room to let her rest for a bit. But as soon as we got upstairs, I could tell something was wrong. She was acting even stranger than before and I could see that she was kind of out of it. I knew something bad had happened to her and I was furious. I didn't know who did it, but I knew that whoever it was, they had taken advantage of her. I couldn't just let this go, so I decided to take matters into my own hands. I started to touch her and she responded by getting wet. It was clear to me that she had been spied on and that someone had taken advantage of her.