Is There a Difference Between Memory and Attachment?

Psychologist, doctor pauline boss was an expert on what she's termed ambiguous loss. That is loss where a loved one is physically absent, but there's no body,. Or where a person is physically present but mentally absent as in dimentia. Do our brains process ambiguous losses differently then they do a more clear cut loss, like an actual death? It's such important work. And i think people really resonate with this idea of ambiguous because it is so challenging.