I'm not sure but I think all eggs are the same - so long as they haven't ever been warmed up by being sat on, they can safely be left up to 3 weeks. She may go on them now there are a few. Rosemary or Chicken lady may be able tell you better, but we had wild pheasant eggs in the garden that were left that long then all 13 hatched out. And you need to get more females - that's gang rape :-)