Not sure if she is broody, my broody hen could not be moved and stopped laying immediatly, it was an overnight thing, you could not move her without her going straight back to coop. We had to take her out of coop as the other hens would not go into lay whilst she was there. We put her in our dog cage, raised on bricks, with a cover over. After two days we set her free and she made a bee line to coop and went back to her broody position, it took till the 5th day before she went back to the other hens and a further week before she started laying again.
My other hen started laying in the coop and one day when the rabbit hutch was open she popped in there and every since she has been desperate to lay in there. I've fenced off the hens to bottom of garden and she is the only one who escapes and walks up and down in front of rabbit hutch, she eventually layed behind the bikes on concrete! I think maybe your hen is the same and just found somewhere she likes to lay. A broody will not move from her spot for food or water!
hope this of help
Gillian