there is a stretch period during the first few weeks of flower. You won't know how big until you grow that genetic in your environment. If you spread her out more as she stretches, she will fill out most of that fence. I would mostly flip her now, because I think your fence is going to make harvesting a major pain in the ass. If you have a timeline because you are going to run out of weed and want to smoke it, I would flip sooner, to get a longer cure, but if you are just concerned with yield and not concerned with the harvest. Weaving her through the fence will combat a lot of the stretch and support her real good. You will get a bigger yield with the additional veg time. When harvesting, try to chop the plant in as few places, and cut the fence instead so you can get a longer dry.