Mack Z's Girl Party is pretty impressive. She's the Dance Moms star I eventually grew to have a crush on.
There's another (I think Hispanic, 10 years old at the time) YouTube star who really appealed to me but I can't remember her name (it'll come back to me). She did her own vocals and released some original songs, and also had these "episodes" where she just kinda talked about her life and shit. She was cute as hell fam.