Sure the leafs are showing potassium deficiency but what was missed is the reason behind it. It’s obvious to me that the deficiency mentioned is caused by overwatering. Leaves are very droopy and puffed up like pillows from being water logged forcing them to curl down like that. Plant has stopped metabolizing nutrients. Look it up for yourself! Best thing you can do is make it dry out as quick as you can to avoid further complications. Point fan directly on soil, increase temp, increase all ventilation, reduce humidity, poke air holes in medium and or let plant sit outside of its pot. make sure it dries out completely before watering again and resume at around 1 cup per watering for the size of your plant and increase amount as she gets bigger. Also raise or dim lights some as she does not need it. Growers should really take the time to figure out issues with plants instead of racing through questions for points. Hope you look up overwatering and see for yourself. I know this will help. Cheers 🍻