"My first thought was to push it back in with the waves. I got in the water, but it became a long, drawn-out ordeal of pushing it out and having it come rolling back onto my shins which are very bruised as a result."
A police spokesperson confirmed they received a report of a "large shark" on the beach near Le Quesne Rd, at the crossroads of Franklin Rd and Dorothy Pl, about 9.20am on Monday.
Allen, who helped save the stranded shark using a paddle provided by a nearby kayaker, said the creature was over 2m long.
"There was a kayaker who gave me a paddle and I dug it into the sand once I got her lifted," she said. "As the tide took her out again, I managed to get the paddle and move her along into the sea.
"We did that about five times and, eventually and miraculously, she just disappeared on one of the attempts."
Allen added: "It all took about an hour in total."
Described as grey with a white soft belly, Allen believes the shark is likely to have been a grey reef shark having difficulties birthing her pup.
Joe Woolcott, a General Curator at National Aquarium in Napier, said some sharks do use shallow waters for birthing their young.
"Some species will use shallower water for pupping," he said. "However, going in right up to the extent of ending up on the beach I'd suggest something else is likely at play there."
Orca had been spotted off Napier on Monday, which led to speculation that the shark may have been forced into shallow waters to escape being eaten.
Woolcott added: "I'd imagine it's most likely a school shark or a sevengill shark, but I'd needed to have seen it to be certain."