ack!!! how to undo delete?!?!
it is possible, the files are not removed, just the entry in the master file table, it is possible to edit the MFT and get the files back, but it is not for the weak of heart, screw up the MFT and you can kiss your whole filesystem goodbye.
There are also utilities out there that may help.
http://www.pcworld.com/downloads/collection/0,collid,1295,00.asp
http://www.snapfiles.com/get/handyrecovery.html
some free, some cost money, I've never tried any, been lucky so far I guess.
Good luck.
PS. if it doesn't work, buy her some flowers and apologise, hell you might want to buy her some flowers even if it does work.