Mostly because she’s not really a character yet based on the original Bride Of Frankenstein.
Alex Kurtzman, director of The Mummy, explained as much during a recent interview with Den of Geek.
The Bride of Frankenstein is currently in early development, with a script by David Koepp that, if what he says is true, gives the character an agency that she lacked in her original movie.
Doesn’t say anything, rejects Frankenstein, he pulls a lever and the building explodes and that’s the end of it.