Problem is that Campy and Shimano are not compatible, nothing works together. You may be able to run a SRAM or Sachs with some Campy components (we have Campy/Sachs 8 spd blend on our tandem) but I really don't know the details. To do this, she may still have to have a Shimano compatible rear hub.
Also, the age of her components also presents a challenge. You have to love this need to have more and more cogs in the rear cassette; it just drives artificial obsolescence and puts money into the pockets of the component manufacturers. 8 speed Campy stuff can be almost impossible to find.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.