Why didn't Allison Doody become a bigger star?
From what I've gathered, by 1994, she put her career on hold, moved back to Dublin, married Gavin O'Reilly, son of Irish media mogul Sir Anthony O'Reilly (Ireland's first billionaire), and raised their family in Dalkey. Divorced since 2006, she has resumed her acting career, working primarily on UK television.
According to IMDb, she turned down the Sharon Stone role in "Basic Instinct," the Nicole Kidman role in "Days of Thunder," and a part in "Lord of the Rings: The Two Towers". So it's safe to say that the opportunities to be a bigger star were definitely there, but Doody just chose not to.
https://evoke.ie/2016/02/15/showbiz/alison-doody-struggled-motherhood
https://whatculture.com/film/14-actors-who-became-absolute-legends-with-just-one-movie?page=8