I’ve received 2 cards in the post today. Different 16-digit card numbers and different expiry dates. I’ve enabled one card against my Monzo app, but I cannot use the user.
My wife is still waiting on her card but here I am with 2!
So your wife’s had the notification that her card’s been dispatched & you’ve just received yours & a spare? 
In that case she can use that card, Monzo cards aren’t linked to your account until you complete registration. Just swipe left with 3 fingers on the queuing screen to & then you’ll be able to get set up 
Then check out this post with tips for new Monzo users 
https://community.monzo.com/t/so-youve-just-signed-up-to-monzo-what-next-tips-bulb-open-wiki/6613/1
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Ok great, we’ll get her setup now!
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Feel free to give the extra card due in the post to a friend once it arrives! 
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