Dear Abby: Coworker who was once my friend now tries to get me fired

Dear Abby: I’ve been employed at the same company for 17 years. I’m the youngest person in the department, and I love my job and the people I work with. One co-worker I used to be close to has a son the same age as mine, and they did sports together and went to each other’s birthday parties. I would invite her over to relax by the pool while our kids played.