Oh please. Mei Yin over the course of the notes fell in love with Diana, so it's not like the story hasn't had non-straight people. Also...having read all the explorer notes, I don't recall a SINGLE reference in Helena's notes indicating what her romantic preference was, so since she's WC's character, they're the ones who get to choose that for her. Also, the synopsis mentions 'after tragedy' she wakes up on the island, so it's very possible her mother and wife (like Mei Yin's brother) are only ever seen in flashbacks and die. Since she IS alone on the Island.