My name isXXXXX am a licensed attorney, and my goal is to provide you with excellent service today.
Yes, you can definitely have her sign a contract that promises to provide $400 a month to pay for the boat. If she then defaults, you could sue her for breach of contract
for failing to provide the $400 a month.
Of course, this would need to be a mutual contract, between you and her, obligating both of you to provide $400 a month.
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