sunlight sativa

I planted her back in may and it's the fourth month going on. She has pistils on each branch's end. I recently transplanted her to a bigger pot. And fed some npk. She gets light from about 5 am to 7 pm and the days are gonna get shorter throughout the next month. How long do you think till she starts flowering...?
Anything else I must do?

Looks like it's starting to.