Do these help? I seriously love this hen the more I look at her
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That's really tough. I am leaning towards the blue partridge. Too much pencilling for blue cream since it's buff based.
Time in the sun can change the feather color some so that could be going on, too. Only really way to get a good guess would be to breed her to a partridge rooster and see if any of the chicks come out blue partridge. None in a good sized hatch would mean she's got the lavender modifier, not blue.