The script finally received a rewrite, and Alice and Rain both became the ultimate badasses of the story.
The rewrites created an imbalance in the script, in which Rodriguez’s character performed all of the badass zombie-killing maneuvers, and Jovovich was more or less along for the ride.
Jovovich noticed these changes on a flight to Germany before commencing production on the film, but before cameras started to roll, she sat down with Paul W.S. Anderson and forced the director (who would eventually become her husband) to take another look at the script.
By “rewrote the script for her,” Jovovich means that Michelle Rodriguez got all of the awesome action scenes that were initially intended for Alice — the decision itself stemming from Rodriguez’s near-overnight stardom with the release of Girlfight.