She resides in the magical world of the Fortress of Eternal Darkness. She has a huge rivalry with the good high witch Phoebe Adams, and they will fight whenever they are on the same lot. This sort of autonomous reaction will always happen when an NPC good witch and an evil witch are on the same lot regardless of relationship.
Frances will usually cast Corruptus Locus to create thunderstorms and cockroach swarms, right after her arrival at a community lot. Like all witches, she is unemployed, so the player can invite her over at any time from 7:00 A.M. - 11:59 P.M. whenever they want.
Frances' personality points are randomized when Belladonna Cove is loaded. The following personality is only referenced in the game files. This happens with all the other high witches from Apartment Life.
Since Frances is an evil witch, she will always have 0 nice points when she is first spawned in-game. Her SimDNA in SimPE confirms that she had medium skin before she became a witch. Frances has the same facial structure as Jaiden Bruenig.