Overwatering or underwatering? What would you do to save it?

Hey I am not sure but It looks like the chicken manure might have caused nutrient burn or blocked the drainage leading to overwatering and root issues. Reduce watering for now and let the soil dry out a bit, and consider flushing the soil to remove excess nutrients

Classic underwatered you can tell because it looks limp lifeless on the other side if you overwater leaves will droop from being heavy with water. Also big plant small container hard to overwater also another clue.

could gnats be the problem? there are hundreds on the stickers...

Appears to be pretty much limp, which would say underwatered. This girl needs water like now. I’d water in slowly a bit.. walk away for 10 minutes or so and come back and water again to make sure she really got some good amount of water

she thirsty

A plant that size needs 5-8 litres...........1.5 litres is nowhere near enough in high temps.

Definitely install a drip system / passive watering device ( could be a plastik bottle with holes in it ), you need to water that Monster almost constantly under your environmental conditions to keep her moist and happy! Hope that helps, good luck 😊

What do you mean by your drainage diminished ? you have more or less drainage? Chicken pellets should be fine if you didnt add too much, but that plant is definitely thirsty like Uk420 said. Did the plant grow faster since adding the chicken manure? Is she in preflower / stretching? Those factors can increase her thirst by alot together with that high temp. and low humidity.

underwatered prety sure thats the only way you get droop like that lol giver her a water and she should bounce back unless your dorwing her with water I'm pretty sure she needs some. hard to tell by picture