Another problem!! Hen abandoned her nest on day 21!!

what did you see when you candled the others scott? any sign of movement?

I've never had this problem nor have I ever candled so not the best qualified to give advice here, but as she has abandoned them (could be that she couldn't feel any movement) and you want to give it a go then it's worth a try. Leave for a couple of days and if no joy then you may have to try opening them up carefully. Don't know what you are to do about the correct humidity though, and if they do hatch do you have a broody lamp and box set up? Try candling again carefully tomorrow (don't hink you have to turn them though at this late stage. Can't offer you any more advice as like I said I've never been in this situation, sorry.