She'd stayed at the Hôtel Beau-Rivage that previous year, if I am right? Yes, must be the Countess, I take it the Empress is the one on the left in the photo then.
Yes, I am reading about the day she arrived at the Rothschild villa(Pregny) and her stroll she took the day before she got assasinated. She was with her reader, wasn't she?