Begin topping the plant?

Hey, buddy! If I were you, I would already switch to 12/12, unless you want her to tear your tent apart! Don't water her for 2 days, then bend her using the LST method and continue into flowering! Just know that the plant will manage to gain +140% of its current size! So, if it's currently 15 centimeters tall, then in about 3 weeks after the start of flowering, it will be around 15+140%=21 centimeters tall! Bend it when its stem becomes less firm and more pliable! The more water there is in the stem during the bend, the higher the chance of breaking the plant, and then LST turns into HST training! But that's not good during flowering! And your girl is already pre-flowering, so I would hurry to switch to the 12/12 light schedule and enter the flowering phase! 👌 Cutting and cloning is just extra stress for her! 👆 Good luck, buddy! ✊😇