Is there a food you love and she's just not interested in??? if so, if she doesn't eat it, does it make you feel she doesn't love you? We all have our personal preferences ... you said several times that you would do anything to make her happy, but you've forgotten that sometimes just accepting her decision is doing something that will make her happy.

I must admit that if I told my s/o that I wasn't interested in doing something, I'd be ok with him asking me a second time, but beyond that, I'd probably just get irritated and dig my heals in ... where if he left it alone, didn't approach me about it again, it's entirely possible that I might change my mind somewhere down the line (also equally possible that I wouldn't - depending on how strongly I felt on the matter). Hope you have continued joy in your life.