I don't think she'll have much comeback with the seller after all remember "buyer beware" saying.
Did she get a written report by her surveyor stating what he checked,ie electrics, structural etc. Because maybe it was only a structural survey or a bank survey which only checks to see if the property is worth the money their lending. If it was a full survey then she may me able to claim from whoever carried it out. The law in Scotland is probably different to Ireland but I would advise checking with a solicitor especially if its going to be a costly procedure to fix.