I got 5 Satin silkie Chicks on Friday. 4 of them are about 1 week old, and the other is maybe 3-4 weeks old. The older one actually thinks they’re her babies

She will chirp and lead them to the food/water, etc. she’ll even lay on top of them like a broody hen would. Is it possible she really thinks these chicks are her responsibility? I have a brooder set up, I was going to put her outside with some of the Old English Game Bantam pullets that I hatch that’re about her size, but she gets really stressed out without the 4 younger chicks. I have made sure half the brooder is warm, and the other half is room temperature.
Pictures:
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Here you can see her poofing up and laying on them to 'keep them warm'~
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Showing them where the goodies are outdoors:
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Thank you,
Kayla