Conflicting views with my supervisor on how a thesis should be written
Would you rather pass your thesis, get a degree, and start to get control of your career or get blocked? It seems to be an easy choice. 

Don't lose track of the fact that this work isn't, hopefully, going to be the best work you ever do in your life, only the first (or an early one). 

Fighting with a supervisor who can be a block is seldom (never?) a good path to success. 

Take her advice on this. Get finished. Get a good letter of recommendation. Move on. Make you own choices then, when it doesn't have negative consequences. 

Think of "getting done" as the big win, not winning an argument.