That's a valid point, there is more of a ticking clock with Hana. And as
ffive noted, Mina was likely stoned. I still think it's a bit sudden, but not as much as I initially thought.
Thinking about it, the simplest way to explain it might be if Felicia encouraged Mina (deliberately or unknowingly) to make the move on Hana. It wouldn't be too hard to have Felicia see some minor spark between them in the after party (assuming the conditions are met), and it's totally in character to help her protege fan the flames.