Did you 'Authorize' her new computer? In order to get new apps, I think you have to be authorized, basically, they need your credit card info. BTW, if you don't plan on using the old laptop,
deauthorize it. Apple only allows 5 total computers at one time. If you have been using iTunes since long ago, you may have old Macs that are no longer around but are using up an authorization. Even if not, it's a good idea to de-authorize it just in case some one also manages to get your passwords...
There are also some prefs in there (Devices?) that may jiggering.