The last 10 minutes I loved this film.
I watched it twice and went back to the final minutes of the film, starting with the note telling Maureen to go to Room 329.
Maureen goes to the Plaza, Room 329 with the bags of Cartier jewelry, She goes to meet the person who she suspects killed Kyra.
In the room, she puts the jewelry on the bed, she then sees someone that we don't see and then, the scene fades to black.
The next shot is of the hotel elevator and hotel doors opening and closing as if an invisible being is walking out.
Is this Maureen's ghost/spirit? Was Maureen killed in room 329?
It seems so.
Back inside, the next scene if of Ingo exiting room 329 alone, leaving the hotel and being accosted by the police. He escapes..
From there to the end, Maureen is only a spirit.
In Oman, she finally realizes that what has happened. "Is it me?" she asks.
(Many commenters about the film seem to doubt that a Personal Shopper is an actual job. Yes, it is. There are personal shoppers in high-end stores that assist the wealthy as well as helping photographers, filmmakers and other professionals find the needed clothing and accessories for their project. Personal Shoppers also work for celebrities, as in this film. It's not an easy job because of the demands and responsibilities.)