I'd be interested to know how the piano is affecting the scholarship/application process, because depending on how that's going, there are different ways to go about it:
1) A music scholarship - your DD expects to use her music skills in school to help offset the costs of her education, much like one would use a sports scholarship.
In this case, a certain amount of push on the piano is certainly warranted, as those are competitive spots.
2) A bullet item on general scholarship and school applications - your DD will be indicating her musical skill as one of many reasons why she should be selected for attendance and competitive financial aid.
In this case, is there any reason to indicate that your DD is no longer actively pursuing the piano? And taking up a new instrument may even look better, because it indicates a more well-rounded child.
The results on guitar would still be proportional to effort, because even though she'll breeze through some of it conceptually, her fingers haven't yet been trained to do what her brain wants them to.
