Which country did this happen in?
If it's Britain, she quite clearly and obviously won't be thrown out of the Army. That's ridiculous.
The problem you have is, unless you know any details, you can't really report it secondhand (apart from the fact she doesn't want you to). If you don't know the who, when or where, it's going to be very very tough. Realistically, the only person who can do anything is her. If you know where she is based, you could think about calling the padre - but I would be hesitant to do anything off your own back if you don't know the actual facts of what has occurred.