Olive oil as some lubricant in her vent may help and will allow you to determine if she has an egg stuck. I did this with my pullet when she was having trouble passing an egg. She pooped both times I did it, but the second time she laid the egg about 3 hours afterwards. (I had also given her a warm water soak). I did not feel an egg either time. You only need to insert your finger to the first knuckle or so, once you feel resistance, don't push any farther.
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