Lst! You may even use the screen of green method. In your situation, many people will tell you to top and fim her, even if she wasnt an auto, topping and fimming will require you to wait even longer in veg, which will just increase how much she stretches in flower. Once they get 15-20" from the light with sativa doms, i flip to flower immediately because i have no vertical room to spare! I made the mistake of topping and fimming, while it did keep the top short for the time being, by the time flower came around they were all so mature and vigorously growing that i ended up at 9-10" from my 1000watt HPS! Good thing its sealed and air cooled.