I would probably sneak one or possible two out and candle them quickly and return them.
Sometimes eggs will hatch beyond day 21 ...into day 22 and 23.. and did you count the day you put them under or the day after that? You need a full day so I count really the second day as day one. Good luck....I've got some broodies out there no and I'm waiting on their eggs to hatch...It's more nerve wracking for me than an incubator....
Lastly have you notice that she's moving much less the last day or two. That's a really good clue the hatching is near as well...