Yes!!! Pay her, pay her lots!!
Hey 3 are you old enough to give advise?
Pay her for the food she produces and let her decide how she should recoup building material and labor costs for the structure.JK
Cool! Ask 3 what she thinks, maybe? And JK. It's tricky, because barter is great. Maybe there is some other trade she'd be into, like books or anything. Something to further some kind of discipline or art she's into? Maybe she has something in mind. Neat structure!
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