Wilting leaves

Wilting might be due to some water damage, take off the plastic covering and aerate the soil. Water when the top 5cm/2inches are dry with at least 20-30% of the water as runoff. Fertilizing should usually start when the first set of leaves have fully developed (start-mid week 2 from seed normally) so I would start giving her some nutrients! If you're having humidity issues and the humidifier isn't enough then try hanging a warm damp towel in the grow space to try and increase it. Hope this helps! Good luck and happy growing :)