To get the essential oil via the enfleurage process, they would have had to mix alcohol into the infusion and shake or stir to thoroughly mix them. The alcohol would then absorb the scent from the fat and after a while would rise to the top of the fat where it could be poured/skimmed off. Then the essential oil removed from the alcohol.
The interesting thing about enfleurage is you can reuse the fats or oils used to gather the volatile fragrance oils in the first place.
Thanks again for the interesting education. Ya learn something new every day!!