Yikes, looks like a whole slew of issues. Definitely see some powdery mildew on your leaves. And in a couple shots looks like there is some mold growth on the leaves. Not sure could just be the pics. Also looks like a combination of deficiencies. No offense but she looks pretty haggard. I'd be tempted to start over as I don't think this plant is going to produce much of anything even if you can get it to go into recovery.
I'm using dirt, temperameture is about 25°C and humidity around 60%Is that coco you are growing in or dirt? If it's dirt it looks like it needs a healthy dose of perlite as I don't see any at all. Which could be a contributing factor in your issue. Might be starving the roots for oxygen causing root rot. Also, what are your temps/humidity like? looks like it might be a bit humid since you have the PM and mold. getting your temps and humidity dialed in makes a much bigger difference than you might think. Not sure where to start on this one without more info but there are a couple things you should look into.