Upvote:4
RΓ©union does not apply the 90 days in a 180-day rule that the Schengen Area does (except for Colombians). Which means, she can enter RΓ©union.
As for the Schengen Area, her stay in RΓ©union has nothing to do with that, so it'll count as a new 180-period when she enters, during which she can stay for 90 days
As for her baby, as you probably know, only his passport or ID card is needed