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When mine began to yellow like that, I feed them just plain water for a bit and they began to adjust, have you tried just water? No nutes, just a thought, good luck

and to answer you questions it is possible that he got an magnesium problem caused through a wrong PH. The yellowed Leaves stay yellow. And it takes time to show up the hole effect of the defiency and yes he overwatered too... But i wont Inject some fertiliser in a prefertilised soil

I had some seeds last summer from a little known breeder in oregon and the seeds were ok...they just needed good treatment and tlc like all plants.

When growing cannabis indoors, add 6-7 teaspoons of fine dolomite lime to each gallon's worth of soil. So if you're mixing enough soil to fill a 5 gallon container, you want to add 30-35 teaspoons (about 2/3 cup) of dolomite lime to the mix. Mix the dolomite lime and the dry soil thoroughly, then lightly water it with water that has been pH'ed to 6.5. After getting the soil wet, mix the soil well and wait a day or two to let the soil settle before checking the pH and adding plants._____________ https://www.growweedeasy.com/magnesium-deficiency-cannabis

Hello I see a magnesium defiency,the leaves are yellowing between the leaves and the tips appear burnt. I dont know why it happens but the "good soil" had a wrong PH for your Lady. You can stopp the yellowing, but already affected leaves stay yellow. I would get magnesium and calcium as single product. ( canna for example)Because the mixed products contain Nitrogen too. For your next grow get dolomite lime or vermiculite to keep the PH stable in a good range. Mix the vermiculite or dolomite lime under your soil

really cool and taste strain.