We have an African-American employee who has repeatedly complained that supervisors and co-workers single her out for poor treatment because of her race. This has ranged from the very serious (that she received a poor review because she is black) to the trivial (that someone told a joke about Barack Obama to upset her).
On every occasion, HR has investigated her complaints. We’ve never found any evidence of discrimination or harassment, which infuriates her even more. Eventually, she calms down, but five or six months later she’s back with another complaint. She’s otherwise a good employee. Any ideas on how to handle her?—Jeanne