Pretty sure that Louis was correct: the faster you bury someone in the burying ground, the less evil they come out.
I mean, Church was buried on the night he died, and the same goes for Jud's dog Spot. They both came back different, but they weren't evil.
Timmy Batterman was buried days after he died, as was Gage, and they both came back evil.
So I think Rachel came back "alright".