Brooding eggs not hatched?

[Pictorhens]

I've had a lavender pekin brooding on eggs for over 21 days now. She's been sat on a large clutch of eggs around 15, none have hatched. They're were due from the latest 5th-9th April but now we're on the 14th April, they seem to have some veins and solid mass in them. Looking for advice of what to do? Do I take the eggs off her now or let her keep on them a bit longer? Will it cause her more harm leaving her?

Thanks in advance.

 

[FarmInProgress]

Try water candling, it works great and doesn’t harm the babies inside as long as there are no cracks