I also have question for Mormons...
I have a coworker who is currently dating a guy who is coming back from his mission next month. He hasn't asked her to marry him, but she already bought a wedding dress, picked out flowers, colors, contacted photographers, etc. Is that...normal? I would be a little freaked out if I were the guy. He has no idea though.
Nope, not normal. If you're correct about him having no idea, I'm with Trout--it sounds like she has a screw loose.