Northern Lights Auto- First Grow

Yeah she has bushed out like crazy. Scared to do any defoliation cause this is literally my first grow and I’m still learning. Don’t wanna shock her this far into flowering. Got kinda ugly cause of a lockout I think. Won’t be using tiger bloom on autos anymore cause it can be too much for them. Switched to calmag and it seems to have slowed the necrosis of the leaves. Been seeing a fungus gnat here and there but keeping under control with diatomaceous earth and letting soil dry more between waterings. Been trying to gauge how much longer she needs, but I really don’t know. 😩Like should I be flushing her?