If I were you I would remove all the eggs until she becomes broody. Otherwise, you're probably fighting a losing battle. I don't know of Copper Marans being known for broodiness.
If she goes broody you can tell by her behavior. Mine sit 24/7 getting up only occasionally to eat, drink, and do a nasty poo. Mine when you touch them or they get up to eat they'll be really puffed up and kinda hiss at me.
Also, if you don't have a rooster then it's pointless, but I'm sure you knew that.