i know why this is happeneing to you, the only way i would use that pot is in a Sog set up, flowering the plant at 8-12 inches, a gaollon per foot, the main culperate is the lack of nitrogen, she wasnt getting enough nitrogen in the early part of the flowering cycle, thus becoming yellow too early and the loss of leaves had occure way to early, you wanted that kind of loss during your last week of flowering, these fan leaves are your solar panels, creating energy for nutrient uptake and the breakdowns of other compounds, no fans leaves = power outage, now there could be many reasons for the nitrogen deficiencie, like i hit on earlier, always happened to me switched to a low N bloom food too soon, now for beefy buds you need more phosphorous, like i said before i liked cha ching, its something like 9-45-10, thats not need, but a good shot of a P-K 13/14 is good, or GH makes liquid kool bloom thats 10-10, in my honest opinion, its the power outage from losing fan leaves, by this happening your plant didnt have the energy to finish up, just barely enough to survive, your next group of plants if you want to grow them out to 36 inchs its critical you use 3 gallon pots, flush once a month to get rid of salt build up and maintain a good soil PH, and start feeding your plants Bloom ferts at about 14-21 days into flower, feed when you start seeing bud sites, they need all that nitrogen for the 3 weeks, so by the time you hit 5 weeks flower you start getting natural yellowing, and by weeks 8-10 you start losing those older leaves, in your garden will be in perfect harmony, put it this way, your plants need to look like that on harvesy day...if you follow these few simple rules you will have an outstanding harvest and the plant will get deficient when YOU tell it to, and you will have total control...control is key, control is the reason why i went to aeroponics, leess work, bigger yield and less time and its too easy to flush, and i never get deficiencie anymore