Did She Just Masturbate ?

Several co-workers and I were sent on a five day course a little over a year ago. I had a female co-worker, who I will call Brenda in this story, sitting next to me during the week. Brenda is attractive, and a very pleasant person to talk to. During one of the training sessions Brenda excused herself from the room. It was not uncommon for someone to take a break, as the sessions were lengthy, and coffee, and pastries were provided in the lobby. Brenda returned to her seat beside me after about ten minutes, and looked at me when she sat down. I didn't think much of it, but then there was an unmistakable smell in the air. It smelled of sex or at least female arousal. Did she just do what I think she did? Well after sitting back down she was nervously glancing back and forth to me and the other person sitting beside her. I pretended not to notice her glances, and tried to concentrate on the instructor, but it was difficult.

Brenda and I still work together, and often when I see her this is all I can think of.

Did she really masturbate in the washroom?