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The more I think about this, the stranger it seems. This is a feature that has existed in Fastmail almost from the beginning, and is heavily used. The way it is implemented is independent of things like the sieve script (which could be faulty in some way). The only thing I can think of is that the configuration for your domain has not been correctly transmitted to one or more of Fastmail's MX servers. Maybe, you should raise a support ticket, and have the support staff investigate that possibility.
EDIT: You could try deleting the alias for your wife, saving the configuration, waiting a few minutes, and then adding it back. Maybe, if there was a hiccup with the MX server updates, this would resolve it. Even then, it might be important to report it.
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