One of our hens decided to go broody in winter. This is her first and our first hatching. After she left her first batch I made a new home and placed 12 eggs under her. 4 were kicked out, one egg was cracked with undeveloped chick, and one was born but died shortly after (unknown y). 3 days ago she 3 chicks were successfully hatched and are still doing great. However there are still 3 eggs left and she is still sitting on them. They were candelled on day 18 so there are chicks in them however it's now day 25 as the others hatched on day 22. I do not hear anything from the eggs, however momma still turned them and continues to sit on them. Do we just continue to wait or is their something we should do. When is too long? We don't want to interfere but none of the remaining three eggs are even pipped. Any suggestions would be wonderful.