I wonder it Hecate taught her about that, I love the idea that one day Hecate takes Persephone under her wing and teaches her all about potions and curses and how to make a ghost do you bidding
I mean, herbs that cause abortion would be something persephone was taught. Most of them are also medicine for other conditions. No assistance from Hekate needed on that front.
Fun example: one part of the cotton plant can be used to quicken the period and lessen PMS, while a different part of the plant is an abortifacient(sp?).