I'm curious. Have you held her egg up to a store bought white egg?
If it is a pale blue then you have a Sapphire which is a Leghorn cross with Cream Legbar, though she isn't showing the typical crest, but that hybrid doesn't always have the crest.
If it is a pale blue then you have a Sapphire which is a Leghorn cross with Cream Legbar, though she isn't showing the typical crest, but that hybrid doesn't always have the crest.

Planning to cross our new Welsummer rooster with our darkest green egg layer - green eggs are the result of crossing blue egg layers with brown egg layers, so what will we get when we cross a very dark egg laying breed with a bird that already lays dark green eggs. Such fun.