Currently Being ModeratedJan 4, 2013 1:46 AM (in response to CRShew)
You were given some bad advice. Your wife needs her own Apple ID for iCloud, FaceTime, iMessage, Find My Phone, etc. This ID must be a verified email address. She can continue to use your Apple ID for iTunes content, but for everything else, she needs her own. You can create an Apple ID here:
Do that first. Then, on her phone, turn off FaceTime, iMessage, Find My Phone & delete the iCloud account. Reset everything up again using her new Apple ID.
This will keep all of your data separate, but you can continue to share your iTunes library.