Breh, those girls had a whole lot of in group fighting. Wanna know who the common denominator was: Aubrey O'Day. Even after leaving Bad Boy, there were physical fights among group members. And yes, there is an NDA especially for someone like Aubrey. It's public knowledge of her causing drama within that group.
And yes, her publishing for Bad Boy is pennies. We are talking Danity Kane, not Total. Name a Danity Kane song. Furthermore, when is the last time you heard a Danity Kane song?
In regard to writing, ANY author would need a publisher unless you have your own publishing. Most people don't, which is why they pay a publisher.