You can also tell her that Swordmaker, the keeper of the 700 member Mac/Apple ping list on FreeRepublic, and a Mac user for longer than dayglored, will also tell you the same thing. Sit me down in front of any computer and I can get into in pretty short order. . . no matter how strong they think their protection might be. Physical possession of the computer basically means it can be owned by a hacker. It is REMOTE hacking that is very difficult and usually requires the cooperation of the user, and getting in by malware attack that is even harder on a Mac.
Now hold on one cotton-pickin' minute, Sword. How do you figure that? The Mac wasn't released until 1984. I used a Lisa for about a year before the Mac came out, but I didn't count that, as the Lisa was a different architecture. Are you saying you had access to pre-release Macs?