Hillary Clinton never voted for the Brankruptcy Bill of 2005. Hillary Clinton was the sole Senator not voting on the bill, because that day Bill Clinton had heart surgery
From Senator Clinton's official statement on the bill:
This bankruptcy bill fundamentally fails to accord with the traditional purposes of bankruptcy, which recognize that we are all better off when hard-working people who have suffered financial catastrophe get a "fresh start" and a second chance to become productive and contributing members of society. With the passage of this legislation, which makes obtaining this fresh start more expensive and more difficult, we are ensuring that many responsible Americans will continue to be buried under mountains of debt, and unable to take back control and responsibility for their lives.
In the days before S.256 was finally brought to the floor Senator Clinton voted for every amendment which would have added consumer protections to the bankruptcy bill. Amendments which were repeatedly rejected by both the Republican majority and far too many Democrats. She even voted against cloture in an attempt to keep the final bill from coming to a vote at all.
Several commentors correctly noted that Hillary Clinton supported the earlier bill (although she voted for amendments adding consumer protections in that bill as well). She wasn't the only Democrat to change her position (voting for the 2001 bill and against the 2005 bill) and I'm not qualified to compare the differences between them.
However, several articles have discussed her change of position, including this recent article in the NYTimes.
For what it's worth, Democratic Senators Akaka, Cantwell, Dorgan, Feinstein, Leahy, Levin, Lieberman, Mikulski, Murray, Nelson (Fl), Schumer and Wyden switched in the same direction as Clinton. John Edwards, who also voted for the 2001 bill, suggested he would have switched his vote as well.
http://thecaucus.blogs.nytimes.com/2007/08/08/clinton-and-the-bankruptcy-law/http://jinchi.blogspot.com/2007/03/hillary-clinton-and-bankruptcy-bill-of.html