My assistant might be afflicted with ebonics. Might she be contagious?

Not contagious. Ebonics is african american vernacular english, which is a bit different from american english. An american english speaker who only spends a few hours a day with a person speaking another english dialect, but is not immersed in the other dialect all day long, is not likely to unintentionally start speaking in the other english dialect.
Doubt it!! The only way I have heard the word ebonics used is in literary terms. Maybe someone else has heard otherwise ?