Don't feel too bad as sometimes it just happens. You did what you could. What brand of incubator do you have?She didn’t make it. And I didn’t assist her in her hatch either. She started working herself out while I was a sleep. I just happened to catch her coming on out. I went up to check on her and she was laying down. Her breathing was slow. I turned the duck eggs and looked in on her again. I seen her take a breath and then that was it.She was gone.
I had a hydrometer in the incubator to help me. I had it at 65%. In order to get it there I had to add 2 sponges and a wet towel. As the hatches happened and humidity got higher I took them out one at a time. I was able to keep it about 70% when the hatching started. I don’t know what else’s I could have done.