How to be a YouTuber's friend when s/he denied me to be her/his friend on YouTube?

I try to request to be a friend on a YouTuber's Channel but she denied me. I add her too many times but it doesn't work. I want to watch an private video that she upload as a public video, but she made it a private video I'm not a criminal. I don't really bother her.
What should I do?