Chicken acting weird?? Help 😅

Yesterday, we discovered one of our chickens had been laying on her nest for a prolonged period. I eventually decided to move her myself, collected egg, and she seemed fine. Then a few hours later around 7pm noticed she wasn’t roosting with the others, and found her once again on the nest which is in a tricky spot (behind our pond on the ground😅 she refuses the nest boxes and we’ve just let her lay here since we got them). I moved her to the coop and she seemed normal.

Today, again, she went back to lay her normal time and hasn’t come out. all day.
We don’t have a rooster. I’m concerned about her.
Is she sad? Sick? Just wants to be a mom? Lol please advise

EDIT: she actually didn’t lay today. Is she egg bound and if so, best methods to help? Warm water bath?