Unusually small egg...

My leghorn (age unknown) has been laying pretty much every day, or every other at times since she adopted me a few months ago. Her eggs have been incredibly consistent in size until today when she laid an it itty bitty egg. Significantly smaller than usual for her. Does this have any meaning? She seems to be healthy and happy. No weirdness to shell, just super small.
New to being a chicken mom so not sure if its something I should be concerned about?
Any insight would be appreciated!