Janet is Jamaican, she works as a receptionist at the pet clinic.
Janet leaves work early because she has to take her dog to a (different) vet.
After Janet goes to lunch, Jackson Fuller takes over her duties and gives her the rest of the day off.
After Matt wins 'Vet of the Year' and hangs a banner in the clinic, Janet rubs salt in the wound by calling D.J. "not vet of the year" and implying she's bitter for not winning. Matt's ego has made him so arrogant he even sexually harasses Janet verbally by calling his employer "love" when asking her to bring a chart to him. Janet doesn't mind because she thinks he's hot. Janet asks D.J. to answer the phones.