Hard to say much without more info, but I would say that could either be needing a small adjustement on the PH, or what I think is that she's just asking you for a little bit more of nuts, mostly K I would say. So give her a watering with some nutrients rich in Potassium and see that gets worse, if it does try flushing because you could have some nut lock.
But for what I see it's not something very progressed so you can still fix that, and you probably only have like two more weeks to go (: