Hey DS! :smokebuds:
I would disagree with the overfert diagnosis because there's no clawing at all on the new growth. I will definitely agree, however, that your lady has a magnesium deficiency. She has the yellowing between her veins and the rust-brown spots, as well as the brown tips on the leaves that are curling up.
If your soil pH is on point, then I would say she's just craving more magnesium. She's a big lady and I've found that all of my autos become magnesium hogs the first few weeks of flowering - ESPECIALLY when growing under my LED's. It's important to keep in mind that growing under LED's makes the plants consume more calcium / magnesium.
What is the recommended dosage for your cal/mag supplement? Does it list all the ingredients in the cal/mag supplement?
I use Epsom salt for my magnesium and have had really good luck with it. I might consider getting some Epsom salt and feeding at 1 tbsp / gallon of water, as well as giving her a foliar feeding with a 2% solution of Epsom salt in water. Continue to add the Epsom to your feedings, as well as foliar feedings two times per week until she gets back on track.
If you want to stick with your cal/mag supplement and aren't over the recommended dosage, you can also try upping your cal/mag as well.
Hello Kindred, Welcome!! i knew one of my deficiencies was magnesium i just didnt know if i could use more than the suggested on the bottle i didnt want to over do it, today i gave her 2ml instead of 1.25 ml. I have the Botanicare CalMag supplement as well as dolomite lime that i occasionally give in a tea feeding, also got some molasses. will go to the local store to see if they got some epsom which they should. the new growths are doing well, everything is getting alll sugary everywhere, bud growth is a bit slowed for what i think it should be but buds are swelling in the daily still

) going to try a 4ml supplement tomorrow of the calmag. hopefully turn this thing around