You know as well as I that "granny content" meant "sex with women perceived to be post-menopausal due to age." Greta fits that perception, as does Makith. Whether or not Makith is actually a grandmother, and whether either can still have children, is different from the perception.
Luthien can become a grandmother in-game. Erevi does become a grandmother in-game as part of the Main storyline. Shakala can become a grandmother in-game if the Spicy mod is installed. Jenny is barren for biological reasons not relating to menopause. Adaobi, Reanna, and Zsofia are barren because they're vampires. None of them are perceived as post-menopausal due to age. The fourth you reference is a special circumstance.