Dont know if my hen is laying or not? please answer!!?

ok so, i own 3 rhode island reds and i never actually see one of them lay in the coop anymore. it used to lay in the nest box but now i never see it laying. 3 of my other wyandottes are broody and wont get up so the red cant lay.the last time i seen it wanting to lay an egg was last week when it was clucking and shouting to get in but obviously it couldnt. im wondering now is it laying somewhere else in the garden. i never actually "lost" it (to say it was away laying) but now im getting quite concerned that it stopped laying eggs. any advice or tips to give me would be very helpful. please answer this. thanks