Glad someone agrees with me. I saw it a few weeks ago. I was unexpectedly surprised at the overall quality of the film. I'm not a movie buff...very far from it but I can honestly say...after seeing this movie...it instantly became one of my favourite of all time.
I think it's her clone at the end. I'm sure of it.
I think the idea is it mixes and refracts ones make up making your identity blend with it, like a host where defining beginning and end is hard to say.