When Mrs. Davis is exercising and Leonard appears, she puts her hand on her chest. In the next shot she is holding onto the machine with both hands.
When Kripke talks to the guys in the cafeteria, a woman in a gray cardigan and black skirt can be seen behind Sheldon and Raj, using the soda machine. It then cuts to a shot of Howard and Leonard, and she is standing behind them.
Tenure committees at major universities are composed solely of professors who already have tenure, so Mrs. Davis, as a member of the Human Resources staff, would NOT be on the committee.