What’s going on with my girl?!

Always let root zone dry up before water or feeding

Possibly just an unlucky seed with weak genetics. It happens to even the most experienced growers. I hope she perks up for you

Don't worry about the humidity for now, give her a good, deep watering, soaking the entire pot and she should bounce back within a coulpe of hours. Probably even 2-3 litres. Water requirements at 90 degrees will be great and I bet the entire pot is dry, from top to bottom.

Oh yeah at that stage your humidity should definitely be up closer to 60% , keep that humidifier going and that intake fan installed to get that air circulation and get her watered! She'll be ok in a few days [:

I am thinking it’s a mix of heat stress and lack of water mid pot to the top soil. I’m installing an automatic watering system with probes that go to those layers. I’ll use two of them in different sides and put on a timer for everyday at 200 ml to start. I have intake air fan coming soon. I can run more humid air from outside in and run a fan inside as well. Thus far the humidifier isn’t doing shit because of all the air exchange. Humidifiers seem like a wasted effort: perhaps I’ll humidify the air next to my intake

that dirt looks dry

does look a bit dry? irrigte based on weight of pot... top layer should dry back a bit to avoid pests laying eggs and reduce other growth on top soil. don't try to irrigate with a set volume of water -- although the needed volume of water probably will be fairly consistent if you water at same pot-weight. You want some runoff... just enough to ensure you got the whole volume wet or if soilless shoot for 10-15% runoff. Soil and soilless are a bit different in this respect. It is no problem to have more runoff with soil.. but the goal is just to make sure you don't get dry pockets wreaking havoc months down the line as they can* buildup unsafe levels of nutes and screw with pH. with soilles you are providing 100% of everything so the runoff ensures it goes back to expected equillibrium given the evaporation that has occured since the last irrigation. evaporation will raises concentration as long as it hasn't hit carrying capacity of what moisture remains.

too much heat for 25% humidity. try raising RH%, if you can... a few cooler degrees wouldn't hurt either, if possible. may not need both... but also may need to do both, lol.. increasing RH will slow down transpiration, which will help in this context. 32C is a bit hot, either way... 30C and below is a safer area. fwiw, i've been 30-31C lately with a low-ish 35-40% RH and avoided droop. So, you aren't far away... ymmv per plant gentics too.