When I applied for my first few jobs, my parent DID go with me, but they made me ask about it and everything. They would NEVER go into an interview with me and I would never with a child of mine. That's just really odd behavior to me. My dad has helped me make my resume and apply online for jobs, but he wouldn't help me fill out and entire application with him.

As a hiring manager, I would be turned off by how much involvement that parent had. It would make me believe the girl was immature or didn't want the job and her parents were making her apply.