I have several reasons to believe she's the real deal. First, she has a video where she discuses an incident that happened at her school. From the video, she reacts like, well, an eleven year old girl. She's unable to fully understand complex emotions (like a teacher disciplining her students, but still loving them), and the content is in the exact same style. If she's reading a prompt, that's very good writing, and she's a very good actress.  Second, bodily function humor. The burping in itself isn't necessarily only something children do, but she does it a lot. A lot. The cuts to burps teeters on the edge of annoying. If that's the editing of an adult, they're fucking incredible, because I am convinced this is something a child would do. Third, if you actually read the words posted on screen when they go up, they're more like an imitation of style rather than an actual grasp on their use. Again, not necessarily a childish thing to do, but added with the other clues, I think it indicates that this channel is all her.