I have two coops each one has 5 nests in it and I have 9 hens, only 1 hasn't started laying yet, and 2 Roos. The coops are connected by a small chicken size door that I can close off if I need to. Funny I haven't noticed her pecking at anyone in the small coop, only the big coop and they do all tend to want to lay in the same nest, so it could be that she doesn't want anyone else using "her" nest. I'm going to leave it be for now and see how things go. I know I have observed her chasing ANY of the Production Reds away from the nests in the Big Coop. It seems to be geared toward only the PR.@ happy hen mama. first question i should ask you is how many chickens do you have ? how many nesting boxes do you have? it can be funny with that bird. she could be the only one in her mind to use that box. i doubt it but you never know. she maybe establishing dominance of queen hen or suffering from what i call the the" little chicken syndrome". that is when the smallest of the bunch of the chicks grows up and decides it is pay back time.
chicken curtains could work , however i never used them mine will either lay in a box or as they prefer the coop floor . they make a nest out of the straw and for some reason most of them lay in the corner in that nest. funny sight hen collecting eggs. 1 or 2 in a box and a whole bunch in the floor nest.
however in short i agree with bee just let it be and watch to see what happens.
I'll continue monitoring to see how it goes. Thank you Bee and Bruce for your response.