Not familiar with this hotel, but have seen DTs in other parts of the world that had an Executive Lounge. Did the lady friend visit include time in such an area? Many hotels charge EL guests not registered as hotel guests at check-in (or later)
If not, and anticipating you met your visitor in the lobby, to escort her to your room, would it really have been a major obstacle to drop by the front desk to present her name, and register her to your room?