You can, but it will induce stress and possibly produce hermies. It will probably be okay, but if you can give her an extra 1/2 hour every day until you hit 16, she may not even notice.
Thanks for the replies guys!
they used to be on 16/8 schedule, but this auto amnesia haze did not bother to get into flowering so i went to 12/12. I'm hesitant about adding even the extra 1/2 hour per day.