I mean her sister has been making probably at least high 6 figures a year doing it...it's not even remotely surprising. It's not technically grooming, but it'd be impossible for her not to have been influenced by it, and Milki has been promoting her instagram for the last month so we all knew/hoped this was coming.
Especially when it's fully planned with an agency straight away.
I won't judge any of creator but motivating your younger sister in going all the way in feels odd. I mean they prepared and promoted it for over 9 months now