It is not the same as blanking out a highly public figure's likeness during an interview which the interviewee expects to become public. This is more like a "hidden camera" segment where the interviewee is assured that their responses will not be made public.

To then reveal a name which they had been told would be kept private is, in my opinion, unethical. This is why journalists fight so hard to keep their private sources just that, private. Taken together with the arguably underhanded way in which you introduced yourself to her, I can't really condone your actions.

Just my opinion. If there are names on a press release or otherwise in the public domain, I believe it becomes another issue.