In this future, Jenny is part of an underground resistance to his rule (and we’d expect nothing less from her), but when her group is found out by the Horsemen and a grownup Molly (now calling herself Lara), the fight leads to Jenny revealing to Molly that her mother didn’t die after all, but that Dreyfuss turned her into the Horseman of War.
This episode began with a trip to the dystopian future that would be brought on by Dreyfuss’ reign.
This, of course, is what made Molly locate the imprisoned Crane and use a spell of Katrina’s to go back in time so she could help Team Witness stop Dreyfuss and his evil plan.