Well, a funny thing happened when I got hold of my wifes phone last night. I thought it would be a good idea to delete our ongoing texts and start fresh. When I deleted her messages and started to put her name in to start a new line of texts her name popped up with some texts already sent and responded to. It was at this point that I remembered that sometimes I will send her a text and when she responds it comes back like it's a different contact but it's still all her information. When I started texting her with that "contact" (for lack of a better word) it all worked fine. Anyway, I had her go through her phone today after I read the items listed above to try again and her "Start New Conversations From" was checked off as her email instead of her number. She was also (only yesterday?) having trouble getting and receiving texts from a friend of hers too andI bet this was the problem. I have yet to hear from her as to if the problem is completely fixed or not.
Now, I do have a question... why is it that if I start a new line of texts with her it will sometimes come back as a second "contact" in my messages list?