Chris is correct, I'm just coming out of a long process doing exactly this. My mother held the original and it got destroyed with other belongings when she died, I had only a photocopy and it has taken 18 months of letters, filling in forms and swearing oaths - all costing a lot of money.
For Heavens sake get her to make a new one - maybe she can sign the photocopy with witnesses, I don't know if this would be watertight, the rules are very strict.