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Really, really bad idea. There are a few places that she could get in the water without pain. Tori's Reef, Yellow Submarine, Batchelor's Beach, and Windsock are the only one's I can think of.
She should take the fins & socks back and get boots with stiff soles and fins that fit the boots.
Wait until they notice all the urchins in the shoreline at the southern sites.
Those interest me as drysuit bootsTell them that we won't appreciate them bleeding on the Bonaire beaches. I actually wear boots designed for our Navy Seals: New Balance OTB (Over the Beach):