So, it looks like I may have to assist. I checked the little one. This little one didn't pip in the air sac. It also looks like it may be shrink wrapping. I removed some of the shell and applied coconut oil. I guess I should have taken some pics. I also opened the air sac. She was chirping the entire time. I've put her back in the incubator for a little while and will go back and check on her. Before removing her initially, I candle the remaining eggs. I found one that I must have missed as it appears not to have even started developing. One has an external pip and the other 2 don't show any sign of movement and no pips. I left them in there in case I just wasn't seeing movement.
It sounds like you're already doing a wonderful job helping the little one!