After Hogwarts, Niamh worked as a Healer at St. Mungo's where she renewed the interest in ancient plants and their properties. She is an extremely gifted Healer and is considered to be somewhat of a prodigy, although she has no talent for DADA.
She worked at St. Mungo's until she was asked by former Headmistress Loryen to take over the School Nurse position in 2053. Niamh was unmarried, but spent a great deal of time with her pet crup, Moki. She moved on to different career choices in 2056.