Graduating from Stanford with a degree majoring in mathematics, Morrison turned professional in 1979. She made the third round of the 1979 US Open. At the end of 1979 she toured Australia and had a win over reigning Australian Open champion Chris O'Neil in Kooyong, as well as making the quarter-finals of the New South Wales Open. She featured in the main draw at Wimbledon in three editions of the tournament.
