I remember that... Rigoberta was revered. But I don't remember what her status became after the lies unfolded. I somehow doubt that the appropriate revisions were made to the canon, however.
A lot of people just upheld her story anyway. Said it was a "cultural" thing to write stories from "collective experience." i.e. It was the experience of others, as well as herself.
Wags said that the book should have been called, "We, Rigoberta ..." rather than "I ..."