Hi Strictlyorganics
From what can be seen from the pictures it looks like overwatering which has caused your young seedling to stunt its growth.
Over watering is the roots for many other problems to start.
-first step you have to do by cutting the water a lot.
When fully dry water her around 1-2 cm from steam With no more then 100ml daily. Or Even every second day for now.
Try mixing the soil gently around the seedling so you have better air movement around roots. If feels to compressed.
Hopefully she will get over it and start spreading soon. Humidity I keep around 55%65% put a plastic cup on top to simulate Dom. So should be good for her for next week
When she starts getting up nutrition up again and starts spreading her root system. She will start production of next leaves.
-If that doesn't help try this
Suggestion to save those ladies.
Get smal 1Litre pods and transplant only in Light mix soil.
Add 0.5 ml root stimulants with 1Litre water. Water Each plant 100ml dayli maximum.
Then mix your wet soil in their old pots to get more air circulation in it and leave it for a week to dry out.
Then transplant the girls back in original pots.
All done continue growing.
Hopefully this help and hope she recovers quickly.
Good luck growing.