ETA: I also think it's the responsibility of people in Ruby's life (be it school or parents) to set stronger boundaries. I know she's technically an adult, but if she's never been told it's inappropriate then she won't know. Her comments sections might hold her accountable, but she can always dismiss this as bullying from strangers.
Absolutely.
Her unhealthy fixation with childhood, other children and being a child again is a huge red flag and it's on full display. There's no way her parents haven't noticed it, considering how she acts, all the creepy pictures of children placed lovingly all over her house, most of her social interactions being with much younger girls and how hyperfocused her interests are in children's literature and TV.
Even if never has any untoward thoughts or intentions, that obsession with staying rooted in childhood is hacking her personal development off at the knees. Her parents should curb that obsession right now and intervene to tell her exactly how unusual and unhealthy it is. But nope, her mother just enables it, films Ruby twirling around the garden dressed like she's 9, chaperones her to school events focused on children and binge-watches Mallory Towers with her, as seen in Ruby's Insta stories the other day.
And even if there's zero intent or thoughts of noncery there with Ruby, Ruby clearly has massive mental health issues that she should be discussing with a therapist and should not be trusted around kids. She's a toxic and exploitative influence on her fans out in the open, I wouldn't for one instant trust her behind closed doors talking to a child. She clearly has no moral compass whatsoever, so god knows what dangerous shit she'd be whispering in their ear, how many meals she'd be telling them to skip, what she'd be guiding them to buy, or what she'd be coaching them to do to become the Ruby proxy that she wants to live vicariously through. And that power dynamic means her young fans are infinitely less likely to question her behaviour.
There's zero reason for Ruby to be socialising with children. She's not a child herself and she's not a healthy influence on anyone. It's a massive red flag regardless of her intentions, and it's indescribably unhealthy for herself and the kids involved. Any interactions with fans should be done out in the open for all to see - it's what her social media platforms are for.