I gotta say, she may have just been nice about it.
Had that relationship gone on a long time, this probably would have been an issue. She cooked delicious things for you, where you could relax and enjoy, but then she has to do additional work to be able to eat when you cook. Seems like you got the better end of that deal, and weren't accounting for her needs.
While we both eat meat, my partner doesn't prefer it, so we've switched to mostly vegetation, including my cooking. Sometimes i make meat dishes, but it's mostly reserved for when we go out. I've learned to adapt because the last thing she needs is more work to do when it's not her turn. This is how almost every veg-meat relationship that has lasted that I know of went.
Not saying this to be pointed, perhaps your situation really was unique, but I'd take some time for self reflection on what her perspective might have actually been.

Because so many people live through it bothering them, and are nice about it, just like in the comment. Spreading awareness of that is why.