How did Stanley Kubrick change Wendy Torrance's character in The Shining?

In his 1980 adaptation of The Shining, Stanley Kubrick significantly altered the character of Wendy Torrance from the version depicted in Stephen King’s original novel.1

While King wrote Wendy as a bold and resilient woman, Kubrick transformed her into a timid and emotionally fragile character. King was highly critical of this change, famously describing the film version of Wendy as a "screaming dishrag" and characterizing the portrayal as misogynistic. King argued that the film reduced her role to someone who is "just there to scream and be stupid," which stood in stark contrast to the character he had created.1

The actress who portrayed Wendy, Shelley Duvall, noted that the role was the most difficult of her career, citing the immense stress of the production. King’s dissatisfaction with these character changes, along with other departures from his source material, led him to eventually produce his own television miniseries adaptation in 1997 that adhered more closely to his original vision.1