What should I do?

[Peter_20]

Alright, almost two years ago, I borrowed a PC game from a friend, and she got to borrow my Final Fantasy 8.
On my way home, I lost the game somewhere, and now I can't find it anywhere.
Recently, this friend started telling me that she wants the game back right now, and I've tried finding it for sale in various shops and on different Internet sites, but without success.
So, my problem is, of course, that I can't give her the game back, and she wants it NOW.
What should I do?