I don’t think she’s mad about the funko pops per se, it may be more she doesn’t think you have any serious life or relationship goals. Did you try couples therapy? She needs to be able to voice out her concerns in a mature manner if she values having a relationship with you. People have all sorts of hobbies, yours is pretty tame tbh, so I think her reaction and inflexibility on this is more about something else, likely her perception that you lack long term goals. But that’s just internet stranger guesswork! Get couples therapy.