I can only assume she doesn’t. The only person she had was her partner/publicist who died (I’m guessing not wife since it seemed like she was keeping her relationship a secret in order to sell more books.)

That’s weird to me. I guess this is a criticism I have of a lot of shows I’ve watched. The leads appear to have non-existent families that should appear at some point. I even noticed it in For All Mankind, where the Baldwin and Stevens families parents didn’t seem to exist despite the fact they were young enough to exist in the 70s and 80s, and not one of them had any siblings.

In many shows it doesn’t matter, and you don’t need to see relatives like that - but it’s sometimes more stark.