On Tuesday, Montreal police distributed her photo to the media.
The woman came forward to police, but could not shed any light on Cottard's disappearance.
Cottard disappeared somewhere between Complexe Desjardins and The Bay department store in downtown Montreal on Dec. 15, and hasn't been seen since.
The 42-year-old Cottard commutes from Joliette to his office in downtown Montreal every day.
On Dec. 15, he left to work to grab lunch and, after making what his partner Lynda Champagne described as "normal banking transactions" at an automated teller machine, he disappeared.
Champagne said he never returned to work, and never fetched his car, which he'd left at the Joliette bus station in the morning.
She said Cottard's last-known movements place him within walking distance of his office, between The Bay department store at Union Street and Complexe Desjardins, at Jeanne-Mance Street.
Anyone with any information about the woman or Cottard's disappearance is asked to call anonymous tip line Info-Crime at 514-393-1133.