My Leghorn hen has stopped laying. She laid 24 eggs in 24 days and the last few she laid she did not want to let me have. she would sit on them all day and i had to lift her off of them to get them out from under her and when i did she was VERY protective of them and would peck/bite me. Now she is not laying at all and it has been 5 days. why has she stopped laying all the sudden?