I disagree. In this scenario her parents do have a straightforward recourse - go and buy her the physical device sold by the patent owners (who's interface is apparently almost exactly the same, hence the patent infringement claim).

Now, you could argue that the patent isn't legit (it may not be) or that the dedicated device is prohibitively expensive (it may be), but both of those arguments are tangential to the point you were trying to refute.