Who is Death talking to at the end of "Death: The High Cost of Living"?

Question

In Neil Gaiman's Death - The High Host of Living, at the end when Death returns back from her mortal form, we see someone was waiting for her; who was this person she was talking to?

Answer 1

It's Death herself.

Here's the full panel:

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As a part of her duties, once a century Death has to take a mortal form and live a day among living things. I interpreted Didi as a temporary Avatar for Death. In the same way as
_{spoilers from the ending of The Sandman series!}

Daniel Hall became the next Dream,

Didi became Death. But also remained Didi. She is both Death, and Didi.