My sativas done this and it was a Potassium def. if it was just the leaves it would be nitrogen but your vines are yellow as well. she’s low on some potassium. Go Grab a bag of black magic 5-5-5 all purpose dry amendments I think it’s 20 dollars a bag and use that on top soil for three weeks and it’ll straighten the yellow out. In case it’s Calcium instead of potassium and I’m wrong, it has calcium in the amendments as well and will also fix it. Your ph imbalance of soil and water is diluting what potassium it’s able to take and even though the plant is taking some nutrients from the soil, some still lock out. I make my sweet spot 6.6 for that reason now. I was using 6.2 and had to many issues and Good luck