Light green leaves

This is my blackberry moonrock outdoor grow she's in week 6-7 of bloom her leaves are just so light green my other plants all seem fine accept her I tried flushing then cal mag. I know she's a few weeks away from harvest so there not much I could do but for the future trying to figure what went wrong I know it's outside so it can be handful of things I did see spider mites weeks ago but since I sprayer her down and pretty much got rid of them she also in outside greenhouse but I have 5 other strains in the green house any help be appreciated

Have you checked the underside of leaves for pests?

Yes I did week before flower I did notice some spidermites and knats but like I said I sprayed the hell out the plant and that seem to work but that was 5-6 weeks ago I've been babysitting this plant and she was fine but within 2-3 weeks her leaves went directly into this super light green or even dark brown color

That pot looks small as hell

6gal pots

Hope you've been careful about the product you used, because theorically you're gonna smoke it,
if you're lucky and do not have spiders anymore,
maybe change your soil and cut more leaves, it is a pretty big plant for the pot.