Chicken not laying in Coop

[Abrahen Lincoln]

My Marans hen is not laying consistently in the nesting boxes, and we've tried everything. What do I do???

 

[BDutch]

My Marans hen is not laying consistently in the nesting boxes, and we've tried everything. What do I do???

What have you tried?
Does she free range?
Please add a few photos / description of the laying nests, surroundings and where she prefers to lay.