Concerned plant looking a little off.

Back ground this is an Autoflower White widow in a seven gallon fabric pot with a 40-40-20 mix of happy frog-ocean forest-perlite. She has been growing fabulously untill now still a dark green no spots just droopy leaves. I've been lst'ing her a bit. so far this girl has been getting bottled water. And it wasn't ph'ed I water a half gallon about every 5 or more days. Till the pot becomes lite to pick up. What could it be. Could fungus gnat larva cause this? I need to get some sticky traps but myself I haven't noticed any flying insects in or around my plants.... I'm stumped any thoughts?

First glance, they look overwatered. Possibly too much nitrogen as well, you’re not feeding right?