That's the biggest load of happy horse shit that's been passed around for ages now and its simply wrong and is also a misquote.
That is NOT what she said and it shows a lack of understanding of how the legislative process actually works. Here's the actual quote: "But we have to pass the bill so YOU can find out what is in it, away from the fog of the controversy." (Analogy, it's one thing to say - "the garage is locked but I sure would like to see the old car that's in there." Compared to - "the garage is locked, I sure would like to show you what the old car in there looks like (knowing what the car looks like yourself.)) She was NOT saying she did not know what was in the bill and she never said such a thing.
Here's the deal and here's why the "take" on the quote is straight up BS. A bill cannot be voted on, until such times as it has been introduced on the House or Senate floor by its sponsor(s). As soon as it is accepted, an electronic version of the full contents of that bill is forwarded to the Library of Congress who maintains a searchable database. In addition, the bill is forwarded to the Federal Register who likewise publishes the bill within a few days.
In the case of ACA. both the House and Senate bills had been introduced and published (with their contents known to everyone in Congress and the public) in September 2009. Pelosi's quote was made in March, some 6+ months after the bill(s) had been published. She knew what was the bill and the larger context of her speech to the group she was addressing was about what she thought were unfair attacks, including things like "Death Panels." By the time she had made the statement, the bill(s) had been gone over with a fine-tooth comb by both sides of the aisle. Six months is hardly a "rush-job" or an attempt to hide the contents of the legislation.