Should there be a comma before "so"?

the puppy followed kim kardashian home so she decided to keep it.

Judy blume's career as an american writer spans four decades and includes many literary awards. she is most famous for her novels geared toward pre-teens. one notable example is tales of a fourth-grade nothing. however, blume also has had success writing for an adult audience. three of her novels for adults reached the new york times best-seller list. in a 2008 interview blume remarked, "i have so many stories left to tell! " by that time she had written nearly 30 novels. judy blume is an exceptionally talented and productive american author. which of the following statements supports the main idea in this paragraph? blume only publishes books that she expects will win awards. blume prefers to write novels for adults rather than pre-teens. blume has had an extremely and uncommonly long writing career. blume is a gifted writer who can write for children as well as adults.