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I'd also wager that might be pointless if she's been using much though as the cog it's on is probably too worn to use with a new chain.
It is possible to buy individual cogs for Campag cassettes. Not sure how easy or cheap it is though.
Brommers-
Cheers @snottyotter and @Brommers. Good point about the one cog being a lot more worn than the others, hadn't considered that.
yak
Any derailleur will work if it's friction and it can cover the whole gear range, you should just be able to take the cassette off and put it back on in order with a spacer between each cog, I think some campag ones have slightly different spacers towards the end of the cassette, hopefully it'll be obvious which ones but if not you might need to Google and use some verniers. I'd also wager that might be pointless if she's been using much though as the cog it's on is probably too worn to use with a new chain.