Cast as Grendel’s Mother? Helen Thomas, of course.
Although entirely appropriate, that would insure the film's instant demise. No one would pay to see it other than adoring Leftist "journalists" who view breathtaking hideousness as a virtue, as evidenced by the long line of Socialist 'heroines'....Bella "Mrs. Hat" Abzug, Rosie O'Donnell, Anybody on the NARAL Management Team, Mrs. Clinton, Nancy Pelosi,..the list goes on and on.
But you're right...an excellent casting for a Mother Demon.