That is maybe more extreme than I'd be willing to state after hearing just one anecdote, though that did sound pretty bad.
no mad, I think you don't have a parenting problem (yet), instead, you and fiance have (at least) a major communication problem. You & child will be super miserable if you don't fix this.
Strategies, assuming you & fiance are both willing to work really hard:
Ask, is your current approach getting you what you want? (for that matter, ask this of yourself as well)
Approach communication problems like there is a system that is failing the both of you, and you have to work together to fix the system. Humans are buggy and you have to find a system that produces good outcomes in spite of your individual flaws.
Negotiate explicit parenting boundaries ahead of time.
Form a habit, ask "how important on a scale 1-10 is this issue to you" before taking action. (This is a speculative idea based on your description. The other suggestions here I have tried personally or observed working for others.)
Form a habit, ask "do you want me to solve this or listen" before solving it. This is especially important for natural problem solvers. It is probably useful in most possible relationships.
If you can find a good one, I would recommend seeing a therapist or a counselor together. A good one will probably be able to give more tailored advice than random people on the internet like me. Judging from my own past experience, I think you should be able to tell whether a therapist/counselor is going to work for you in two or three visits.
Your daughter is possibly old enough to have a valid and useful opinion about the relationship; ask her.
(Bonus tip: try making a list of 10 things you admire/appreciate/respect about your fiance. If this is hard then you probably really should start thinking about an exit strategy. It may be easier to make a good stay/leave decision if you have a plan for each.)
I am just some guy on the internet and this isn't a licensed medical opinion.
I hope you figure out the best course of action for you & your daughter. Good luck.