They are giving out their phone number to people they met on roblox.
The child is institutionalised, their parent cannot control their behavior meaningfully and the adults at the institution are pretty negligent and she doesn’t trust them.
I have messaged like my whole family and some friends for advice but nobody is getting back to me.
It might also help to ask why she’s giving out her phone number to strangers on the Internet. Talking to you about it might mean she’s unsure about it herself. She might be very lonely. Does she have friends her age inside this institution? Or save friends outside who could chat? Is there a way to get her save real live contact with other children? Is there anyone she could write letters to? Or at least age appropriate books to read?
She doesnt really have any of that, and I am not in a position where I could arrange her social life.