With the greatest of respect, she worked with him on a daily basis for a number of years so I would say her opinion of him is very
relevant. I didn't see the interview but I assume she was asked what sort of person he was and she answered accordingly. If he was nice to her and treated her with respect, then I can't see any real problem with saying that.
Should she be forced to add a caveat that she is "shocked and appaled" by the charges or something along those lines ?