This just happened, and my DD is beyond thrilled.
She follows several Youtube gamers, and a few days ago she mentioned that she thought she saw the handle of one of them playing the same game she was. Today she saw her sprite in the gamer's new video.
My DS has had the same experience. He always excitedly calls me up and shows the video and points "There! Right there! I just ran by!"
(he's EpicNerd7, in case she ever sees him)