Yellowing seemed to stopped spreading ,im not sure what deff is that .No yellowing on the small leaves on the buds . I gave some cal mag 1 week ago and spreading seemed to be stopped but it turnes so yellow very quickly
Have you give any nitrogen (grow nutrient) to your plant? nitrogen defiency shows by yellowing leafs. But yeah itäs true that some strains fade when ending their flowering cycle. And your strain is one of those that could change color to more autumn colors in the last weeks of flowering.
I wouldn't be concerned looks good!
Looking good ... Just got done harvesting a Northern Lights Auto myself. Got about 63 grams off her. I wish you the same success
Good luck with the rest of your grow.
I think your plant is fading, that is, since the harvest time is approaching it is slowly dying, it will yellow no matter what you do. It is normal, don't worry