Yellow leaves with brown spots

Nitrogen is a mobile nuturent so you will see the yellowing go from old growth to new growth. This is more new-mid growth. Either your deficient in a trace element, Zink or Manganese(not Magnesium). or you have to much phosphorous and/or potassium. My guess would be you have over fed and have a buildup in the medium. First thing to check is your runoff PH. see if it is in range. If it is correct then next you want to compare your EC going in to the EC going out. If the going out is really high then only water until it starts to come out at a good level before adding nutrients again.

She looks like she need some nitrogen. Seems to be yellowing from the top down. Plants will always need a small amount of nitrogen during flower. Try adding a small amount of grow nutes or if growing organically, try coffee grounds. However, I am not sure if that would break down quickly enough...Just know it has a good amount of nitrogen in the grounds. Keep an eye on your pH and EC. Always allow the substrate to almost dry out before watering again. I hope this helps, good luck and happy growing