Whatever issues you have with Fortnite probably don't have much to do with her. She left in 2017. Until the tail end of her tenure, Fortnite was a very different game.
As was said in other threads, what she writes is more comparable to cigarette industry or casino operators than to ethical design. Therefore, even if she wasn't directly responsible for the loot boxes, she seems to have thoroughly internalized and rationalized the unethical design of the game.