Fixing the Color of Hair Roots?

My mom's hair is dark brown with grays. Two months ago I dyed her hair chocolate brown. I used hazelnut 7.3 for the roots and very light blonde 9.0 for the rest of her hair from Koleston and I got the color perfect. Though, my mom wished if she could have had a darker tone of that chocolate brown.

Last night I dyed my mom's hair with following with the aim of getting a darker chocolate brown; gray blonde 7.1 for roots and light blonde 8.0 for rest of her hair, I got the rest of the hair fine, but unfortunately I got greenish light brown roots. So which color should I apply for roots to fix it to match the chocolate brown of the rest of her hair?