They are CORROBORATED by credible witnesses! (i.e. employees of the Inn where she worked, friends, hospital staff)
How do you know they are "credible"?
And, by this standard, since more than one person allegedly heard her "brag" about the incident at a party, that is CORROBORATED also.
The fact of the matter is that we know very few facts from the case. We can all form our own opinions based on what is in the media now, but to pretend that that opinion is somehow factual is silly.