I am really sorry you are going through this. I read through the list of greivences and I don't think any of them really hold water - not to make this big a stink about
1. That is just silly.
2. Most men don't cook . Maybe it's just me, but I really don't know anyone whose husband is whipping up meals for them. Regardless, you still tried and offered - that is what counts. She should get over it. You are supporting the both of you right now! Why bring up such meaningless stuff to create negativity for no reason?
3. Wow. She seems like really high maintenance. Now maybe you knew this going in, or maybe it has progressively just gotten worse. Regardless, its seems a tad ridiculous. I would think it would be a given if you are both living on one salary right now that the trips would be limited. Common sense. Does she come from money? She should ask her parents if so.
4. She probably just said that out of anger since it seems she didn't always feel that way. Kids eat chicken fingers mostly, yes you would be fine! Grilled cheese, salad etc. That's a really lame thing to say to you.
5. You got her a gift and she returned it? Most people would say thank you and tuck it away somewhere if they really didn't like it. Or maybe even try to like it a little just because you picked it out. But then, she continues with the ridiculousness re the elliptical?
I don't know, it sounds like you are a great guy and are doing the right thing in life. Why do you need this? It's one thing to put up with someone's annoying habits - it's another to be miserable for no reason.
Is she doing well in school?