Willie Engstrom served as the housemaid in the MacNeil Residence. Throughout the movie, she is seen involved in house chores. She once cleaned the urine that was leaked by a possessed Regan MacNeil during the house party. She accompanies the family during the events of exorcism but doesn't travel with them and is left behind in Georgetown, Washington. She is last seen locking the house entrance while Chris MacNeil and her family departs.