Hello, Abby, welcome to BackYard Chickens! Thank you for joining our community. 
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Glad you joined.Yes, essentially. It’s a hormonal thing. It’s called being “broody”. She has this instinctive drive to sit on any eggs she can find & move to her nest— her‘s, another hen’s, or even falsies.So, she's just trying to keep eggs warm, even though the only eggs in the nest are decoys?

I'm glad you've decided to join this great community. With tons of information, I hope you find what you're looking for 

We're so happy you've decided to join us 
We are so happy you have joined us.