Hi, you are right, your plant cannibalised herself for the stretch into flower. So its an automatic, and her life is terminated. i wont e confused of the yellowing now, you cant do big things or wonders. concentrate to the flower.....As you havent filled out the data schedule for the feeding i cant get to detailed.. Stay with your blooming fertilisers. give her some molasses, that feed the microbacteria in your soil( and helbs the plant to absorb nutes). She dont look to bad, its better to have a defiency than an excess. Keep the magnesium and give her molasses and blooming fertiliser... for 10-12 days more... after that she will be ready to flush and harvest ... greetings