People change over time, in small amounts, but enough over the years to grow apart significantly. Sometimes those are shared interests (kind of irrelevant), or core values (more of a big deal). Put in some legitimate time with her, away from your kid. Make yourself interested and excited in the things that interest her (unless it's some total bullshit like knitting, which while useful, is the most annoying and frustrating thing in life), and get her to do likewise for the things that interest you. Find completely new things to both enjoy together. There's so much in this world to see, experience, and enjoy, that quite frankly it's nonsense that neither of you can find some common ground or interests. You actually have the important part down, you love who she is and the qualities that make up the person she is.
After some legitimate effort if you find there's really nothing there, move on. If you come to that decision together there's no reason it can't be amiable, and it won't affect your kid negatively like people seem to think. Kids don't get fucked up because there isn't 100% presence of both parents. They get fucked up from the fallout of a horrible divorce and the negative post-divorce relationship between parents.