It looks like your clone has already been topped, meaning the dominant top shoot has been removed and the energy is now going to the branches. You can top again as much as you want, just make sure to give it a week or two between toppings. I would wait to see which branches are tallest and top those. Over time you can achieve a nice even canopy.
Looks like you have some nute burn or something going on with the leaf tips, so don't do any topping until that's sorted and she's growing vigorously again.