I jumped on their web site and as far as I can figure, Colibri only has a one year warranty. Since there is a sentimental attachment to the lighter I'd give them a call if the rubbing alcohol doesn't work. It probably won't be free since it's no longer covered by warranty, however, they may still repair it for a fee.
Or
Xmas is around the corner, maybe it's time to ask your GF for a new one.