April*** sorry about that
Let’s start over (I had a long day at work and my brain is slipping into neutral

)
Your hen started spending all day and night on the nest starting March 23. You’re positive she was dedicated at this time and wasn’t just building her clutch? Did you notice her being broody and giver her the eggs to sit on?
April 17 you took her eggs and put them in an incubator. What kind of thermometer are you using? Are you sure it’s at the correct temperature?
I’m just trying to sort things out in my head as this doesn’t add up. In all my years of letting a broody hatch, the eggs rarely went past the day 21 mark since a broody is always the right temperature and humidity. Anything past day 23 under a broody has never hatched. By 31 days they’d be rotten.
I don’t have any helpful advice about what to do with your current eggs. I’m pretty hands off with my broodies, and don’t assist incubator hatches. I have tried in the past and it’s never ended well.
I will share how I manage my broodies, though, in hopes that you can glean something useful for the future. Sometimes I will let my broody hatch within the general population as long as she’s not setting somewhere that the other hens will want to lay their eggs (the hen’s “rank” in the flock can sometimes make a difference as well). If I do that, I will give her eggs that I have collected. I use a Sharpie and draw a circle around them so I will notice if anyone decides to add to the nest. Once a day O quickly lift the hen up with one hand and grab any unmarked eggs.
Sometimes I will separate the hen by sectioning off an area of the coop with chicken wire or something. I put food and water in with her, far enough from the nest that she has to get up to eat and drink so she doesn’t poop in the nest. Either way, she has to get off the nest once a day or so.
I candle the eggs at days 7 and 14. The first candling I mark any questionable eggs, and discard any that are obviously not developing on day 14. Sometimes I candle closer to day 21. I try super hard not to mess with the broody closer to day 21 as I don’t want to take a chance on her abandoning the nest - especially close to hatch date.