from The American Heritage® Dictionary of the English Language, 4th Edition
- abbr. Latin Philosophiae Baccalaureus (Bachelor of Philosophy)
Sorry, no etymologies found.
I don't see how being a PhB student would explain it, though.
She's not a PhB student with interesting course requirements is she?
As for PhB students, their alternative assessment is usually assigned either by their advisor, or by their course lecturer i.e. me, and either way, the lecturer has to be informed of it all so that s/he doesn't fail them for not doing what everyone else is doing!