This "growlady" has no idea, ignore her comments.
Cannabis gets pre-flowers that indicate the sex of the plant and they get these after a certain age. It does not mean the plant is actually flowering, just that the plant has hit "puberty". They get these primordia/pre-flowers even if the lighting is more than 12 hours, even at 16+ hours and is perfectly normal.
Don't worry, your plant isn't flowering, just identifying her sexual orientation.
Hope this helps, Organoman.