In her lawsuit, which also names the team, Erika Ross Smith alleges Ellis began sending her several dozen explicit messages, sometimes several times a day, starting in November 2010 while she worked for the team's community relations department.
The messages included lines such as, "I want to be with you," and "Hey Sexy," and periodically asked her what she was wearing or doing, according to the lawsuit.
Smith would often reply with "What do you want?" or "I am sleeping," the lawsuit claims.
"On a micro level, my client has endured unwanted harassment, has suffered and continues to suffer emotional distress and trauma," her attorney, Burt Boltuch, said at a news conference in his Oakland office. "On a macro level, this type of conduct, especially in the sports world, must stop.
"She was embarrassed. She was intimidated. She felt scared and helpless."