Gini Dietrich had her sights set on law school and becoming a sports agent. Then her mother needed her help to overcome a life-threatening illness, so she took an entry position at a public relations agency. Passing out samples of juice at publicity events seemed an unexpected detour on her career path. But now she is the founder and CEO of Arment Dietrich, an integrated marketing communications firm, author of “Spin Sucks,” co-host of Inside PR, lead blogger at Spin Sucks and founder of Spin Sucks Pro.