How much time are we talking about Weby?
Well you need to contact the consulate and then they'll advise what to do. Most likely it will end up being overnighted to them for correction, reprinted and overnighted back. I'd say if you can get them to agree to correct it and you get it to them tomorrow morning then probably Tuesday next week you'd get it back.
Not a lot of time but you shouldn't have booked any travel yet either so you should have time to do this. It MUST be done before she leaves the US if not then you're going to have to apply for ILR when she gets here and be out £900 for the priviledge.
Get it sorted through the Consulate.