They played that off by suggesting that the original ending was just a fantasy from the book she was writing. I don't think they ever won the lottery in this version of their reality either.
sad that i know this but yes the end of the last episode had her sitting at the kitchen table in the same old house writing her "novel"
what she wrote was
they never did win the lottery
her sister was gay
Becky was really married to the big bang guy (forgot his name in the show)
Darleene was really married to Mark
Dan died