Couple things... measuring dryness to your first knuckle isn't an accurate measurement because the soil below is likely still quite wet, so there's a good chance you're overwatering, which means too often not too much. Can you get a cheap moisture meter till you get watering down? They need a dry period so the roots can get oxygen, this is how they breathe.
She looks dark, which usually means too much nitrogen, I'd say you're on the cusp of overfeeding, the recommendations are usually a max dose and assume everything else is dialed in for her to use what you put in. She may not be getting enough light to use all you're giving, and if she's too wet she's also slowed down. Blurple lights are kind of obsolete at this point, but work with what you have.
Neem oil... are you still using it? If so stop, it's not for use in flower. Also, if you use too much, it can block the stomata in the leaves from functioning and prevent her from transpiring, which is exhaling water through the leaves, further slowing water use and other functions.
Is that a heater or fan? Either way it looks quite close and may be causing further stress.
