I think this is what she meant by stealing. They downloaded her video with a program that could download youtube uploads and then re upload the videos as their own. I see this practice on youtube quite often and most often it's viral videos. But this happened to a youtube user who made makeup tutorials and I can't remember her s/n. Someone uploaded videos and pretended to be her.
I think if she wants to upload again she should put a small side panel copyright or her her s/n ©chisellecouture 2010 or whatever year to deter video the stealer.