One can transfer 100K points per year to another account. If the booking is then made in your wife's name (obviously not enough for your whole itinerary), that would be a guaranteed way to get her Platinum benefits for two more people.

[See post immediately below for another way pursuant to T & C 3.2.c.ii.]
​​​​​​https://www.marriott.com/loyalty/ter...ault.mi#redeem

If the room is not booked from her account, any benefits for your wife would be at the generosity or mercy of the individual hotel.