I saw a buildasoil video recently and he really described it well. As you're saying it will stretch to 2 or 3 times the size so you really need it to not end up touching/getting too close to the light so it technically all depends on your space. He also doesn't recommend that you let her get so tall so that your buds will have around the same amount of light.
Just another small tip, if you're planning on doing some high stress training (such as defoliation/lollipopping) it's important to let it recover for a couple of days before switching to flowering so it goes into flowering with full force.
Good luck with the rest of your grow, your plant is looking healthy