The man followed her in a newer model, white, four-door compact vehicle through the Corona Ranch apartment complex at 990 Ely Road around 8 a.m., police said.
At one point the man exposed himself and began masturbating inside his vehicle, police said.
The suspect is a man in his 20s with short black hair spiked upward and brown eyes. He was wearing a black, oversized puffy jacket and blue jeans, police said.