Pink Cherry Loaf came back from the Princess's service with a fiancee and a plan. That plan is to get as far away from her family and Ponyville as she can, as far as she can get and still be in Equestria. Her new husband has a job lined up with his family in Rock Valley, which is pretty dang remote. 'Pink Rock' has left behind her family, her name, and everything to do with her old life. 'Pinkie' hopes that'll be enough.
But no matter how far you go, family will find you. It's what they do.