Hey NeroHero,
You topped her fine :) Some people like to top how you did and some preff to do it when the plants are bigger.
Topping can be done as much as you want until the end of growing, do not top in flowering stage.
But everytime you top, 2 new brances will come out of it. This will take up lots of energy for your plant and your buds will not be massieve.
Some people pref a lot of brances with smaller buds and some just top the main brance(cola) and leave it like that.
I would advice you to not top again, do some LST and remove lower nodes from every brance after having alot, these nodes(future branches) are weak as well.
Ps, LST can be done in many ways, just look into it which way you preff.
Goodluck growing :)