Sorry I was brash in earlier post op, I see now that it's not about the medal being genuine, it's about your concern for a friend and the medal is irrelevant.
If she hasn't mentioned it to you then I think to try and bring it up and then do an immediate intervention will make her feel silly and close up to you.
I'd advise asking in a friendly way 'so who is the special person who won a medal?' Then play interested girlie chat. Find out as much as you can. Then continue being friend but gently advise not to send money etc.
If it is a scammer, they are very clever, they won't directly ask for money, they will make it think it's her idea to give them money. At the first point you realise money is being asked for, report to action fraud. Be armed with information about the Facebook profile, get screen shots, importantly get the user's unique profile URL as this is the only way the police can obtain background information relating to the user. (To get this, if using the Facebook app, click the 3 dots the copy profile link )
Good luck op, hope your friend sees sense.