She's a great chess player but she's never been a World Champion. There's no need to embelish her story. She's currently training to become a surgeon at University of Missouri School of Medicine.
I think that's an honest mistake. She was awarded the Women's Grandmaster title and the International Master which is confusing unless you look at the standards. It's arguably a world title holder? Maybe? https://en.wikipedia.org/wiki/Dorsa_Derakhshani
Grandmaster just means you have reached a certain elo and have completed certain requirements (win a number of games, against certain opponents etc), and won a certain number of competitions. There are around 2000 current grandmasters.
World champion is much much more selective, meaning literally winning the world championship.
Don’t get me wrong, grandmaster is incredibly prestigious, but is much more “common” than world champion.
(International Master is the rank below grandmaster).
For clarification, the Women's Grandmaster and International titles are conferred after a certain level of achievement overall in one's career. There is no limit to the number of people who can have those titles. I feel like if you use a phrase like "world title holder" there's an implication that such a world title is like "champion of whatever" and is only held by one person at a time (like a "World Champion(ship title)").
She holds the title International Master, so I guess OP thought that's the same as World Champion? But she's currently ranked 6365th of active players.
Ding Liren is the current human "open" world champion, but there is also a women's world championship, currently held by Ju Wenjun. Plus there is a world junior championship, world rapid championship, world blitz, etc. Magnus is probably still the world's best human player, but he decided to drop out of the WC cycle because he got tired of winning it so often, basically.
The strongest chessplaying entities in the world are entirely machines, which have surpassed humans by enormous and uncrossable margins. The top engine for the past few years has been whatever the latest version of Stockfish is. The top human players spend enormous amounts of time studying machine analysis of various openings and game positions.