How do I retrieve the key from the tree branch?
You'll need a tool. Have you found the dart in the boat yet?
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Read the riddle on the dart. Where have you seen flowers around here?
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Under the tree, sure, but remember some flowers that specifically hid something from view already?
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Before Calvin kicked them out of the way?
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Go to your quarters and move the flowers to yet again reveal something of interest.
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A crossbow would certainly help shoot down things that are out of reach. But you want to retrieve them, not shoot them down. You're missing one more step.
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Go retrieve the yarn ball you dropped on the chief's head.
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Explain your idea to Calvin so he'll give it to you.
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Now use your clever invention (crossbow with dart attached to yarn) to get the key.