My chicken layer is now One Year Old and hasn’t layed eggs.

Hi Everyone. About a year ago I was blessed to acquire three beautiful pullets. A Hy Line Brown, Black Australorp and a “Blue Sex Link” or so they said. Anyways, both the Hy Line brown and Black Autralorp laid their eggs quite quick at 4 months old, laying almost every day. But my “Blue Sex Link” hasn’t layed and my worry is centered about her health more so than the eggs. She is beautiful and active, no worms and parasite, all three roam free all day in green pastures, I give them layers feed in an automatic chicken feeder so they always have enough food plus what they eat from the patio andas well an automatic water chicken waterer with clean water. She lays often with her sisters and seems to be trying to lay or at least thats my impression. Her combs are different from her sisters, a bit black and red. She is the strongest of the three, as well fastest runner, its very difficult to catch her but ones you do she is just very charming and calm. Her poop comes out same as her sister in terms of color yet at times, she poops with a large quantity of water I would say. I would like to discuss her health based on what I just mentioned and the images of her, since I’m new to this incredible experience of caring for layer chickens. Thanks anticipated.