The 25-year-old, who plays Jo Sugden, wanted to leave the show last year, but producers convinced her to stay for another 12 months.
She was involved in a storyline where Jo suffered at the hands of her husband Andy Sugden.
A source told The Sun, "Roxanne wanted to leave last year but the producers put her at the centre of this big storyline, which is only going to get more harrowing.”
"Now she has agreed her leaving terms and will go in a huge exit in December."