I Bring Pocket-Dimension Supplies to the Past and Become Everyone's Darling

She was an orphan from the 21st century. A dream inexplicably sent her to the apocalypse, where she stockpiled trillions' worth of supplies before returning to where she started. To her surprise, less than a month later she transmigrated again, this time to an earlier era, where she and a powerful old man had to rely on each other. All she could do was follow her heart and watch the world change with a smile!

She taught the despicable family of her grandfather's new wife a lesson, found ways to keep the enemies who had secretly harmed the original owner's family busy, and set off infighting in their household...

“Going to the black market is only so I can use the supplies in my space more openly. So unless it's absolutely necessary, I'm not going there. I'm not selling anything. Your big sister isn't short on money!”

“That old man who's technically related to me by blood is pretty much my kind of person when it comes to protecting his own! Fine, I'll accept you~”

“You, Number One Mama's Boy, stay away from me. I don't like you, so don't cling to me, and don't let your mother get the idea that I can't live without you! I hit hard.”

“You, Number Two, with your family situation, we're not right for each other. I don't look down on anyone, but I know myself. I'm absolutely not going to support you and your whole family.”

“Hey, handsome. You're excellent at everything and you've got a great body, but please stay away from me. Don't shake my resolve to be a happy slacker. Men will only slow down how fast I can draw my blade!”

“So what if they're living in the cowshed? I'm not going to suck up to people who treat me coldly. Not everyone in the cowshed is a good person, and your big sister has the strongest connections of all! Why would I need to curry favor with anyone?”

(Stockpiling billions of supplies + a space that becomes its own little world + no do-gooder heroine + no supporting others financially + 1v1 + ...)