lower light intensity will slow her growth down . The screen will still be full enough to flip when your space is available again in a week. The lower intensity will help curb much overgrowth.I feel people are underestimating the stretch on GG. I forgot you were in sips, so she may not be as fast as soiless or hydro in growth
Also, in my earlier post, I didn't mean the overgrown screen to be a bad thing. It is better imo to overgrow the screen and prune back at flip what you don't want, as opposed to not filling the screen and waisting canopy space with empty holes in your net.
You won't "master" the scrog on your first run of the strain, it should be a learning experience for theclone of the next run. As stated previously, comoare your growth from a week ago until now and you can gauge pretty much where she'll be at in a week ie. hiw many tops she has put on,how much stem growth has occurred etc.
Do you think she has a pretty good root zone established? Another thing to consider when thinking how much growth she'll see in the upcoming week.
Adding a bigger screen might just be the easier/best option. That way, you aren't sacrificing growth by pruning back good growth for space while increasing your yeild.
Win Win!