yes she needs to can some strength and grow some more nodes before you think about topping her, also what size pot is she in now? Topping can be done twice for a total for 4 colas if done correctly, im sure you know this because you are not asking HOW to top but IF you can, once again for sure wait, but as long as she is Vegging you can top her, Just NEVER top a flowering plant (hope any of this helped) Good luck buddy!!