The woman, Andrea McNulty, resigned from her position at Harrah's in Lake Tahoe, Calif., "because of the way she was being treated by her employer," said her attorney, Calvin Dunlap.
McNulty's lawsuit seeks a minimum of $440,000 in damages from Roethlisberger and at least $50,000 in damages from Harrah's officials, regarding the alleged incident in July 2008 in a penthouse across the street from the upscale Edgewood Tahoe Golf Course.
McNulty, a former VIP host at the resort, alleged in her lawsuit that Roethlisberger lured her to his room under the false pretense of needing his television repaired. She said she didn't file a criminal complaint because she feared Harrah's would side with Roethlisberger and she would be fired.
Roethlisberger has denied the allegations and maintains the woman acted voluntarily at all times while in his room.
The lawsuit, which was filed in Reno, Nev., is proceding, as Roethlisberger's motion to dismiss the case was denied. Roethlisberger is also seeking unspecified damages in a countersuit.
Information from The Associated Press was used in this report.