According to Deadline’s sources, “the net is cast wide toward many kinds of actresses” for the role, with mostly unknowns being looked at right now.
Venom 2 is scheduled to begin principal photography soon (though supposedly not as early as next month), so if Shriek is actually participating in the sequel, then we should find out relatively soon who will play her.
Shriek, who has close ties with Carnage in the Marvel Comics universe, will apparently take part in Venom 2, though Sony declined to comment to the outlet about if this is indeed the case, citing the “early-days status of the project.”