The woman in question's a civilian, so has no information nor any clear line to take
The MOD has clear rules for service people and civilians alike. Perhaps she should go to the Civvy Admin office and read the info. It should also be available in her normal place of work.
If you are certain that this is a case of harrasment, then you have a duty of care to report it, why should it matter if other QFI's know who you are, if they offer any antagonism for the release of this information then that WOULD be harrasment.