She might need one. And she will have exactly the right size. It was always such a rush when a kid needed something that normal people don't keep and I could produce it. And one for their friend too....
A sturdy cardboard box is so full of potential.
Also she might have plans for the boxes. Have you asked her? My tower of boxes is for mulching the garden. Only this year - I've actually been using them up!
At one point, my kid asked for some of my boxes for moving and I said "they're gone.". She said " What?!" and I said " they're gone. I used them up in the garden. All I've left is the flat ones the windows came in because I haven't cut them up yet.". She was shocked. I was sad because I couldn't give her boxes. But then, she was really proud of me. And she told me it was ok, she could get boxes somewhere else.
Is there cardboard recycling in her area?