"This is a really scary question to answer because people instantly just hate you for even saying that anything is close to unsavory or whatever or however you want to put it," she says.
Director Bill Condon, who began working with Stewart, Pattinson and Taylor Lautner in 2010, says the young megastars understand the pressures of the spotlight.
"They appreciated the good stuff about it, they were able to kind of glide through the stuff that wasn't so good, and, really, they're three very grounded human beings who really just, I have to say, matured into better versions of themselves," Condon said. "They didn't get altered by it, which is kind of extraordinary."
Stewart said it's been an indulgence to play the same character for so long, but there is some relief in having reached the end of her story.
"There are so many beloved moments in this series that we would think about for five years," she said. "They weigh on you, whereas in a normal movie, you've got five weeks, five months... We, for five years, have been waiting for the story to be told. And now that it is, I don't want to say that I'm so excited that it's done, because that sounds like I just don't want to do it anymore, but I'm just excited that we don't have that on us anymore."
Wrapping up the second "Breaking Dawn" film was a relief for Condon, too.
"It's something you obsess on for so long," he said. "It's good to say goodbye to it."
Pattinson and Stewart are also glad to finish the last round of "Twilight" promotions and press interviews.
"Doing press for a different movie, you're literally just talking about the movie," Pattinson says. "This, 90 percent of the time we're talking about our lives rather than the movie."
"But this is it," Stewart says. "It definitely makes today easier."
Follow AP Entertainment Writer Sandy Cohen on Twitter at www.twitter.com/APSandy .