My seedling is wilting. Other seedlings are healthy and larger.

It sounds like it just got too dry. It will likely perk up here in a few hours with water. Sounds like that was all that was wrong. Intense light on a seedling makes it stay short or burns them, not double over like that.

if that isn't physical damage, try moving it to less intense light and see what happens. when young, tehy will double-over like that if given too much light too soon. if the soil was completely dry or near, that could cause a loss of tirgidity, and it could fall over, too. because teh substrate volume is so small, irrigate at first sign of drying up top early on. (later top layer changes color for coco or 1" deep for soil and similar to soil water capacity substrates) As always, water entirety of volume. you don't chose the volume of water to give, you give enough that entire thing gets wet - alittle runoff is fine in soil. if soilless you want 10% runoff waste religiously. based on your description of watering habits, this 2nd option is definitely possible. correct your watering habits before you cause a problem several weeks or months down the road. saturate, wait till top dries enough, repeat. never half-water the substrate or spritze the top of it... all that will do is promote superficial roots and confuse you about how dry the more important zones are -- below the surface. the wet-dry cycle promotes deeper roots and avoid pests/pathogens. Yes it can come back.

hemp is resiliant, i never use such small containers for my seedlings for this reason, they are easy flooded or dry as desert go with abigger pot at least 1l ( i like to start in 3l ) and you will see its much easier watering is the hardest part to learn but if you start lifting yur pot when its watered and checking the weight, when it comes to watering you will be fine, using fingers to chekc the soil is great too using fiber growbags ehlp you too, to avoid problem so go with larger containers and we will see