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lee1972 said..
Having a mast foot insert I figured she could also learn to windsurf on it, anything negative about this?
You will need a centerboard for her to learn. If you know how to windsurf, you do not need a centerboard, but it is mandatory for teaching kids and do not disgust them.
No need to install a central fin box, I guess a simple wood board with a fin/dagger on it taped to the hull could suffice (or strapped around the board)