i agree that you should definately tell her; not in a malicious way tho that will make her think you're jealous or bitter or anything along those lines.
im a bit concerned tho that she wont seek you out again as shes already asked, what reason has she got to ask another time? in which case she may start or is already experiencing nasty surprises.
perhaps you should go directly to her, saying 'about what you asked me before, i wasnt saying the whole story' or you know, that kind of thing. if it didnt come accross in a malicious way i think i wouldnt fobb it off so quickly...