Sorry not to have replied before but I was out until late last night.
Apart from 'Recuva' there are a number of other similar products available, just Google for 'data recovery software'. I only suggested 'Recuva' because it has worked for me in the past but mainly with camera cards that went pear-shaped and it is generally well thought of. Failing that about the only option you are left with is re-doubling her efforts to find the print out.
I appreciate it is no consolation at the moment but your friend needs to work out some method of backing up her data to external store. By this I mean regularly backing up her work - which is the important stuff on any computer - to some form of external storage whether it be DVDs, a memory stick or an external hard drive depending on the quantity. I regret I cannot be more optimistic, but give 'Recuva' a try.