You're right. I bet your daughter hasn't done what Dah.veed suggested, because the process he refers to is substantially fiction.
It's nothing like what he describes. At least now. Perhaps it was like that once.
When you first go to the app store on a new Mac, rather than the carefully gated procedure he describes, filled with warnings and clear indication of what you're doing, it simply pops up a request for your Apple ID, with no indication that it's going to bind it to the "free" applications.
You don't get any warnings at all until you go into the App store and run Update explicitly from there after it has already completed the application binding.
At that point there is a warning, in tiny, barely legible print, framed in language that will only have any meaning once you've discovered this problem.
That this process is broken is something of an understatement. Perhaps it was fine under Mavericks, but under Yosemite, it's seriously flawed.
All you can do is throw the applications in the trash and re-purchase them. A top notch job in alienating new users from Apple.
Even better. New Macs come with Yosemite pre-installed, complete with an iPhoto install that won't run on Yosemite.
