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I would think that any age is ok - I'm thinking of 4 yr old Daisy in Little Men, lol. It would be less about the age and more about the actions. This is the time to do that "show, don't tell" thing...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/39894 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would think that any age is ok - I'm thinking of 4 yr old Daisy in Little Men, lol. It would be less about the age and more about the actions. This is the time to do that "show, don't tell" thing. Throw some sentences in that show her tending to others - plucking lint off their clothes as she smooths their sleeves, making sure someone has all they need before leaving. Think of things a loving mother would do (ruffles hair, chucks under a chin, words of encouragement) and have her do these actions to everyone.