First Grow Carmel

No need to worry, your plant "knows" what it is doing. If she keeps falling over, add a bit more substrate to your pot. The extra layer of soil that buries your stem will prevent it falling over and over time, roots will sprout from the buried portion of the stem. increasing both water and nutrient uptake. Hope this helps,.... Organoman.

That's an insanely filled out auto. I grow autos outdoors, so I would absolutely welcome this amount of growth in the short veg time that they have, but I can understand it being worrying in a limited enclosure. I would have been asking myself if you got a photoperiod by mistake, but your lighting is still 18/6 and it's flowering, so it's definitely an auto - just a very productive one. You'll probably have to do some training to keep her manageable, but otherwise it looks super happy and whatever you're doing is working like a charm. All the best with this!

If you have a fan that blows and gives good air movement to her she should be fine. The fan will help build up her stock and branches.You can always support her later on if needed.