a fragmental sentence: a new book with an old husband, perhaps

[Eway]

Dear Teachers,

I read this from The Right to Write by Julia Cameron:

"I don't know how you do it," I am sometimes told when I am embarking on some creative pas de deux that looks risky to others － a new book with an old husband, perhaps. Writing is how I do "it." Writing is how I do everything...

What does it mean by "a new book with an old husband, perhaps"?

[SoothingDave]

She's giving an example of something that "looks risky." Writing a new book with her "old husband."