Underahat
The MOD has a clear set of guidelines on how civilians can make complaints. They are very similar to those for service personnel. I'd advise the lady to contact her civilian line manager and get hold of the regulations and make her own complaint.
I complained recently of harrassment and bullying and despite an ultimate win I believe you can never win when you take on your chain of command. Giver her the advice and don't get involved. Your own bosses may not forgive you either publically or privately.