If you are looking inkjet, get one with the big cheap standard cartridges, printers are cheap, they try with the ink. $0.06 a page or $0.02 a page, drug stores and office supply now do refills. $5 or $54, some come with tiny cartridges when new. Look, go one line, check what owners say, sellers all lie.
In Laserjet I go for slightly used HP office machines. The little home models do not last, and parts are hard to find.
If your sister is 16, she may forget what she said, mumble something that is supposed to be an apology.
Laptop envy is the curse of our time.
If she is not a little sister, run an ad in the paper, Free to Good Home, with her name and a few details.
Take a deep breath, say thanks dad, and wait it out.
Little sisters do become human, well most of them, and it can take a long time, but wait and see.