@Gregg79
In former days it was possible to change the accountname in the account settings, not sure if it still possible (as there is an issue with the identifcation).
Maybe consider to have your wife her own account and add her as the co-host to the listing.
Profile pictures can always be changed by clicking on "update photo" (just below the current picture, when logged in) in your profile:
https://www.airbnb.com/users/show/185878746