At the Walker Stalker Convention in New Jersey this past weekend, Laurie Holden (who played Andrea), along with Jeffrey DeMunn (who played Dale) were on a panel and talked about their time on the show. Laurie Holden told everyone what was supposed to happen to her Andrea character and from her comments, I get the sense that showrunner Glen Mazzara back then, didn’t really know where the show was heading himself. Here are some quotes from Laurie Holden:

“Well I had an 8 year deal, I was supposed to be there until the end. I was supposed to end up with Rick. I was supposed to save Woodbury on a horse, and I was buying a house in Atlanta. I got the call at 10 o’clock the night before, while I was shooting, from the show runner who is no longer a part of The Walking Dead, saying that they couldn’t write the episode and that he was killing my character. So we all got the script everybody on the set was sobbing. I felt like I got shot. None of it was supposed to happen the way it did.”

…

Holden went on to say, “I think The Walking Dead is in a really good place now with Scott Gimple. It wasn’t the ship that it is now. I’m very grateful how it was written that I went out with grace and with a stellar cast. It wasn’t the way that I wanted but I loved the way I went out.”
Source: fanfest.com