Why won’t Clinton release the transcripts of those paid speeches?

Why won’t Clinton release the transcripts of those paid speeches? - The Washington Post:
Hillary Clinton had a chance to put to rest swirling questions about her paid speeches to groups such as Goldman Sachs during last week’s final debate before Tuesday’s primary in New Hampshire.
She pointedly refused to take it.
Here’s the key exchange between Clinton and moderator Chuck Todd.
Todd: “Are you willing to release the transcripts of all your paid speeches? 
We do know through reporting that there were transcription services for all of those paid speeches.
In full disclosure, would you release all of them?”
Clinton: “I will look into it.
I don’t know the status, but I will certainly look into it.
But I can only repeat what is the fact that I spoke to a lot of different groups with a lot of different constituents, a lot of different kinds of members about issues that had to do with world affairs.”
“I will look into it” means, of course, no way, no how, not ever.
But why did Clinton respond that way?..."