EMILY is Emily Dickinson and SYLVIA is Sylvia Plath, both from Massachusetts (Amherst and Boston, respectively) and born 100 years apart. SYLVIA the psychic won't reveal how much time has passed since EMILY died, but she does reveal to her the fact that her own mother wanted to leave her in the woods and that she doesn't know how to do anything else but talk to the dead which echoes a sentiment that resembles the emotional atmosphere of Sylvia Plath's BELL JAR.
The movie even opens with the Emily Dickinson poem "Haunted".
Looking at Mendoza's earlier work, in COLMA: THE MUSICAL, Rodel buries his poems around the house while Maribel calls him "Emily Dickinson". And in YES WE'RE OPEN, the lead character is called "Sylvia" and she went to Smith. Sylvia Plath went to Smith College. Interestingly, Sylvia Plath committed suicide when she was 30.
I think Mendoza just wanted Emily Dickinson and Sylvia Plath to meet.