So in the December chapters it's mentioned it had been 10 months already. So so more than 12 months later and she's still 16.
I give up, there is no intention of having any of the characters move forward. It's all just bait and regression to the same situation.
It's okay, too bad the author just did filler for 10 chapters leading into a rushed ending. Would have been good if he actually continued the story so he could do a proper ending.