Umm, I haven't been in that position but I would imagine this isn't something you could talk through ?
You could change the style of sex but honestly that isn't actually the same, it's just different and it either makes you happy or it doesn't.
Ultimately most (younger) people drift back into relationships where they are sexually happiest, rather than try to persevere when 'something' is missing. Even older people may change their mind once married.
Sorry that isn't very encouraging
Best you can do it talk to her about where she wants to go next.