The story was that Lefevre had signed on to shoot a small indy pic with Paul Giamatti and the shooting schedule conflicted with production on "Eclipse."
Sure enough, those "scheduling conflicts" seemed to be a point of contention with Lefevre who issued a statement explaining her side of things:
“I turned down several other film opportunities and, in accordance with my contractual rights, accepted only roles that would involve very short shooting schedules,” she said. “Although the production schedule for 'Eclipse' is over three months long, Summit said they had a conflict during those 10 days and would not accommodate me."
Summit Entertainment says that it was not just the 10 days in question and that Lefevre was not completely honest with them:
"The Twilight Saga: Eclipse" was expected to start shooting in early August. If Ms. Lefevre was, as she describes 'passionate,' about being part of (Twilight) we feel that she and her representatives would have included us in her decision to work on another film that would conflict with (its) shooting schedule."
And now that Summit is going to replace Lefevre with Bryce Dallas Howard, the speculation is that the producers were quietly trying to replace a lesser known actor with a more popular one. A dirty tactic, but common in the world of Hollywood.
And naturally, Twilight fans are all in a tizzy about this, petitioning Summit to reinstate Lefevre. Yeah. That'll work.
Steven Zeitchik of Hollywood Reporter's Risky Business blog has all the details.