For me it's all about the big picture. I mean this is your fiancee, not just a girlfriend. You are telling each other that you are ready to spend the rest of your lives together. In that perspective, I think the issue of the baby food smashing and complaints about dry cat food are not that big of a deal.

As long as everything else is ok, you could see this as a positive - pick up a case of baby food on the weekends and take turns winging it at random objects - maybe a junk yard or something where you can smash and snap a photo without any issues. Maybe even make some collections of the photographs on a blog site, social media, or even a youtube channel of the baby food smashing.

The same is true of the dry cat food complaints. Maybe other people are passionate about cats and their dry cat food. Maybe a PC social group is in order, or even some meetups of like minded people to lobby and protest against dry food. It's just deep rooted love for the finer things in life that could be driving her.

These are unique characteristics of your fiancee, not things that need to be changed, but maybe whole-heartedly embraced. I mean when you say "I love you" the "you" should be inclusive of her quirks and challenges!

Good luck, lobster hands!

"Always look on the bright side of life" - Monty Python