Verified answer

No technically not. She leaves for places like California for a while (a few years actually) she runs away because she isn't coping with Susie's death. She comes back when Jack has his heart attack and stays presumably because she's beginning to get past Susie's death and to cope.

I assume you mean in the book so no, they don't divorce. She leaves him and moves away for a while but she comes back in the end. I assume she stays and makes peace with the fact that Susie is gone and doesn't run away again.