Are you saying she has never laid in a nest in this coop or has never laid in one of your nests at all, even in the old coop? Has she just started laying at night? Does she have a regular laying pattern, like mostly every day or every other day?
Different triggers tell a hen when to release a yolk to start the egg making process so the egg should be laid during daylight hours. Each hen can be a little different so you can get some variations.
An important one is daylight. How dark is the coop at night? Can she somehow be triggered because of a security light or street light? If she has just started this I think it has to be something with the new coop.
I can't come up with anything else. You may have to choose with things as they are or getting rid of her.
Different triggers tell a hen when to release a yolk to start the egg making process so the egg should be laid during daylight hours. Each hen can be a little different so you can get some variations.
An important one is daylight. How dark is the coop at night? Can she somehow be triggered because of a security light or street light? If she has just started this I think it has to be something with the new coop.
I can't come up with anything else. You may have to choose with things as they are or getting rid of her.