@rtax1
As I said, information from box 3-6 is not reported on an income tax return (except in 1 rare situation), so if only boxes 3-6 change, there is no reason to wait, and no need to file an amended return when the W-2C arrives.
(The rare exception is if she earns more than the social security wage base of $160,200 for 2023, and also has schedule C self-employment, so that a change in boxes 3-6 would change the amount of self-employment tax she owes on the side gig.)
