Nothing terrible will happen to Wednesday if she deconverts

The terrible thing has already happened at this stage. Telling your children that lies are true (i.e., that Mormonism is true), when they have no better way of discerning the truth than simply believing what you say, is abusive and anti-moralistic. It is fundamentally destructive of a person's ability to cope with reality.

I have never heard a story of deconversion that was painless. Everyone I know who has deconverted from a religious upbringing has undergone large amounts of internal (and often external) anguish. Even after deconverting most have not been capable of severing ties to the destructive people who doomed them to this pain in the first place.