If you have no other hens that are laying or close to laying age, one of the Silkies had to have laid the egg.Could some one please respond. I need to know!!!

I'm pretty sure my partridge pullet has started laying eggs. She's about 7 months..maybe 7,5 now. She's been laying down in the coop, like a broody hen would. I can't know for sure because we have several hens in the pen laying, but I'm about 95% sure that the smallest eggs I keep finding are hers.