Help identifying deficiency

your ph is of, flush your plant until your run off is at 6ph, let her dry out a bit and when she does add cal mag to her feed, other wise cut the dead leaves off as the plant is focusing energy to grow new stuff as well as some of that energy is going towards the dying parts, the damage is done on those leaves, cut them off and move on, you can also use Epsom salts and make a foliar spray for immediate use of the magnesium , if you do this your plant will rebound 100%

Magnesium Deficiency or Nitrogen Deficiency IMO but can be Sulfur Deficiency, I dont think its that though. Here this might help.... https://www.growweedeasy.com/cannabis-symptoms-pictures