Unless your sister hydrolocked the engine (which is possible) then a new engine shouldn’t be needed – open up the fuel line to the rail, jump the fuel pump relay, and let the pump take all the gas out of the tank.
Fill up with diesel and run the pump again until diesel comes out.
Change the oil in the engine as it’s possible some gas could mix with the oil and that’s bad for the cylinder walls.
After that, it should run fine. May be tough to get it started.
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