The evening cafe scene also requires 20 Perversion points for Angie, and only triggers on Mondays, Wednesdays and Fridays (in-game).
If you already meet these requirements then it could be a bug. In that case, let me know (preferably on Discord) and I'll try to help you further. :)
Jenny can also be found in the school's library (2nd area) in the morning and afternoon.