As a living person and non-member of WikiTree, your prifile has to be Unlisted, and therefore invisible to anyone but the prifile manager.
Your late mother is different. She is related to other people besides you, and they might want her profiled here. You might in some version of reality be able to get her profile deleted, but I wouldn't bet on it.
As Emily said, try the Profile Manager first. If not satisfied, email firstname.lastname@example.org.