A few questions to try to narrow down the actual problem...
You said you'd previously booked reservations under your account. That means your wife must have a "managed by you" profile on your account. Your wife now has her own MDE account. Are you connected to *that* account as Friends & Family?
If you *each* have an account, and you *each* have the other person as a "managed by you" listing, you're not actually connected.
You'll also find that you'll have issues with old MagicBands not working with new reservations.
You can fix one connection yourself by going into your account, and next to your wife's name click "invite to Plan & Share" and fill in the email address your wife uses for her account. When she accepts, anything listed for her under *your* account will move over to her new account (old MagicBands, reservation history, etc). The only issue is that this may leave you showing up twice on your wife's account, one that's your actual account and a second that's the "managed by her" version of you. There's no way that I'm aware of to combine those two. You have to call MDE Help Desk and get them to merge the two accounts: (407) 939-7765
-Rob