I don't know where you live, so keep in mind that this only applies to the United States:
Under the Chafee amendment to U.S. copyright law, authorized nonprofit groups (like Bookshare.org and RFB&D) can produce copyrighted materials in braille without needing permission from the copyright holder. However, I believe this applies only to scanning print books. I do not believe it applies to decrypting DRMed electronic documents, unfortunately.
I'm both a member and a volunteer of Bookshare.org, which is only for U.S. citizens. They have thousands of books that are already in text DAISY and braille (.brf ASCII, not Duxbury files). You can also get .brf files from NLS's Web-Braille if you're signed up with your state library for the blind. If you're trying to convert textbooks, there is already legislation in place requiring textbook producers to provide their electronic files to your daughter's school's disability services department for brailling.
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