With the divine ability to manipulate the very concept of life, and a control freak by herself...
The chaotic catgirl Remi (note: my profile picture girl) will be delighted that there be a ready-made dystopia that she could take over.
The people have already been used to oppression, poverty, malnutrition and diseases.
They have never tasted freedom, nor have the will to oppose their Supreme Leader.
So what if Remi just becomes the new Supreme Leader? Nothing much would happen, probably.
With an electromagnetic barrier around her, no bullet may ever reach her petite body.
Even if her body was destroyed, she regenerates on the spot or even respawns somewhere else.
As she storms into the Supreme Leader's lair, the guards and soldiers that tried to stop her dropped like flies.
It seemed that puny mortals have no match against an immortal cosmic horror in the form of a catgirl.
Remi had not just one instant death move anyways, frying one's brain with millions of volts was just one of them.
And then, finally, she stood in front of the Supreme Leader.
"Hey, do you like cancer?"
"#$%#@%#$%@$"
"Oops, I don't speak circles and squares."
And then, Remi used her life-manipulating powers to cause grosteque mutations and tumours on the Supreme Leader, turning him into an eldritch abomination. The sound of bones cracking was melody to the chaotic catgirl.
When Remi was bored of the modifications, all cells of the "monster" died at nearly the same time, rotting into a pile of stinky mush.
No one that opposed Remi survived. Or maybe they did, but not in human form, put in a zoo for public display.
After all, Remi loves human experiments and genetic engineering.
And this land is abundant of materials.