PITTSBURGH -- An Elizabeth Township woman thought she was keeping track of her daughter, only to find out she had no idea what was really going on.

Debbie Delsignore said on one recent Friday night she couldn't find her 16-year-old daughter.

She said, "She was gone Friday night. I reported her as a runaway. I left messages, sent text messages, no answers."

Delsignore finally found her 16-year-old on ages daughter at a home in Elizabeth, but she had no idea what her daughter had been doing until her older daughter discovered some shocking videos online .

Delsignore said, "I was shocked. I like cried. I couldn't believe that my daughter could be part of something like that. I was sick. It made me ill. "

Her daughter and a group of teenage girls from several communities had met on a dark road and the girls began fighting.

Someone videotaped the fight and posted it online .

The fight stemmed from an online feud that had begun several weeks before between the girls.

Delsignore said she was shocked when she looked at the video.

She said, "They're very proud of their violence. I mean, I'm just shocked. I 'm just shocked. I mean I'm not a parent to just sit by and allow my daughter to go on with this type of behavior. "

Pradeep Kholsa, dean of engineering and the CERT Center at CMU,looked at the video of the fight.

He said, "It's amazing most parents know that their kids use the Internet, but most parents don't know what they use theInternet for."

Delsignore has grounded her daughter.

She said, "The Internet used to be a great tool, but it's now become also a tool for communication and for violence."

Delsignore's daughter suffered a bruise to her head from the fight.

She doesn't believe anyone was seriously injured in that melee.