>>510112036 (OP)Is it you from last time? I went to sleep. So basically decide your principles and the style of life you are going to live and show it. No matter how shit keep that general attitude and imply you can handle it even if she throws tantrums it should be treated like your favorite snack being out of stock not a big deal and wont affect your day? Whereas fighting and yelling from her actions just shows the outside world will overwhelm you one day and she will suffer for it.
Tldr just be firm and congruent even if tantrum treat her like its no big deal and doesnt affect your stress or emotions