aww I'm so glad you found her and a neighbor helped you out!
That's such a heartwarming story.
Pit bulls are AMAZING escape artists. When Amy has busted out of containment (before I got her and once when I had her) it's always been to get to her person, not away from them. Your dog probably freaked out that you were gone and tried to find you.
I believe you we spend ALOT of time together I don't want her to have separation anxiety though :/