First of all, congrats on getting your first eggs from each of them! They are happy on their environment!
She is young and inexperienced, you may have to show her what the boxes in her coop are for. Eventually she will learn. I have found that having and older, more experienced hen to show the younger hens how she does it. Most of what chicks learn comes from mama and the older flock members, if they were in a brooder then they have never been taught how adult chickens behave.
So, now you have to teach them.
I would try putting a different bedding in the nest or lower one nest. Even try adding nests. Chickens are very curious about "new" objects or changes in their environment. Put wooden or ceramic eggs in the nest as well when you change it. (golf balls work too) This will cause her (and the whole flock probably) to hop in and out of the nest and look around. You will peak her interest in the the boxes and what she can use them for.
Also check her for health problems, she may not be able to get in the nest.
It is more likely that she is just young and somewhat careless about her eggs. After all, she is still very young and needs to learn the correct way that this is done. Just hang in there, she will catch on I am sure.
Hope this helps!
Timothy in KY
