I would Not set her again----I would break her(if you need help on how to do this---ask) let her get back to normal----she will go broody again. What you feel happened to cause her to not hatch?
Not sure what happened-- I don't have a roo, so I got 5 eggs (likely fertile) from feed store and set her the same day they were laid. Set up in a nice broody coop inside the tractor. Broody rarely got up off her eggs, but saw her several times out for a few minutes at a time. She kicked one egg out within first week, and I candled remaining four at day 14 (my first time ever so wasn't sure what I was doing....) but of the four, only one looked viable (I could see vein lines and a blob). Still no hatch at day 25 so candled it then and it looked very odd-- vertically, it was dark on one side and clear on the other. I tossed it ... didn't have to heart to open it and look. I'll give her a break for a while and try again. She acted like a crazed roo when she joined the flock - I turned them out to free range. She was chest bumping and pecking.... I guess she has to restablish herself? She also flew up onto a branch--not too high which I've never seen before. Just acting weird. Postpartum depression?