Everything everyone said above! How awesome that you're making this effort. My husband has always been very supportive of my decision and respectful of how I eat, even the thousands of times I've slipped up, but after eight years, he still doesn't know the difference between fats, carbs, and proteins. The best thing you can do is educate yourself about everything she'll be dealing with so you can understand why she doesn't want to eat the lovely breaded, frozen fish sticks (but it's meat!) and french fries (it's a vegetable!) you made for dinner LOL.
Yep, her emotions may be all over the map...our fat stores a ton of hormones, so when the fat burns off, those hormones are released. BUT one possible bonus for the both of you is that many, many people have stated that all those fun new hormones also make them way more, ummm...amorous? So there's something to hope for as well!
Good luck to you both!