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Published 11:13 21 Mar 2018 GMT
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Her mother had parked the car on the slipway and nipped into the family's outdoor pursuits business to get money, according to the BBC.
Kiara was airlifted to hospital in Cardiff after she was found in the car but was later pronounced dead.
She was due to celebrate her third birthday next week.
In a Facebook post, her father said the toddler had had "an amazing but short life."
"She was an incredible, happy young girl who lived I hope a great adventurous fun life," wrote Jet Moore.
"And may have done more than most people."