Where have all the good eggs gone?

[isa andy]

My isa brown started laying about a month before my rock and road island red. About one every day. They were beautiful too! Now that the other two are laying my isa brown has suddenly stopped.? She also appears to not be keeping up in size. She does eat very well and appears very healthy. Does anyone have any clue about my egg issue?

 

[carlf]

Sometimes they just take a break.
Or she is "hiding" her eggs. Are they free-range?
If so, pen them up for a few days and see if eggs start re-appearing.