Possible major deficiency in late flower. Three photos of the current situation in week 9 of diary. A few photos show the progression in earlier weeks.

What you're most likely experiencing is an environmental issue because your VPD is off. It's making you think you have a deficiency. Increase your humidity you about 45-50% and you should be alright. I would also test your soil ppm to see how much salt build up you may have in your medium. You can add lactic acid bacteria to help break down the build up as well as humic acid. Hope this helps

Is it all threw the plant or just the top of the plant bc the max flowering time is 12 weeks you might just be close to harvest bc sometime especially with the plants leaves will start to turn yellow and sometimes even fall off because it's taking all it's last nutrients to grow the buds before it dies bc it's seasonal plant so befor you do anything take that it mind

It's a whit widow auto and you at nine weeks let me check something for you real quick

Heavy toxicity, nitrogen and salt build up, too deep into flower. Nothing you can do in soil, just push this grow. 6.3 phed dechlorinated water when needed, 10-20% run off. Always collect it and throw out. Girls at late stage of flowrr or beeing sick drink less and longer, dont bimp into overwatering. Lift pots, when light load it again. You can drop light intensity a bit, like 10% down, leaf degradation will slow down a bit, but it will be progressing for 2-3 plain watering cycles. It takes around 7-15 days , only then maybe ... Harvest is close, a bit more trim, smaller harvest, but you will get something. Take off just totally damaged or died lieaves. Leave as many as you can, dont run of esthetic look.

Too late to fix anything now before harvest........she is close. I don't really see any deficiencies, I see burning from feeding too much or too often........or both. At this late stage, I would stop all fertilizers and only give plain water until harvest maturity. Remember, what is showing in the leaves now, is a reflection of what was happening in the root zone 2 weeks ago. The plant won't die, it may struggle a bit, but it won't die.

Hello my friend, this is a calcium and magnesium deficiency. When I look at your nutrients then you provide enough cal-mag and when I look at your pH this is definitely in the right range. So that shows me that this is caused by a nutrient lockout due builded up waste nutrients inside the soil. To solve this problem you want to give the pot volume in water. So for a 10 liter pot you want to water 10 liters with water. You want to flush the bad stuff away. You do this with water with 50% from the nutrients that you give now and a pH 6.5 After you have done this you want to let it dry till the top inch of the soil is completely dry before watering again. Then you can continue to water like you did before. But cut the nutrients to 75% from what you give now and make sure to water till runoff.

I think its might be caused by the way too much doses of blooming fertilizers while no feeding with N. But I cant be sure while no info about using those nutri's. Are u watering every time with fertilizer? She still needs some amounts of nitrogen to develop healthy leaves. In my opinion yellowing leaves are signal of deficit of N because she uses N in existing leaves drying them in this case.