How old is she?
As an organist, with a pianist DH, it's a very different instrument. I always find it funny that organists never think they can play piano to a good standard, but pianists always think they'll be fine playing an organ. Yes, they both use keyboards, but even the keyboards operate differently, which changes how you play them.
Add in the differences in musical styles, musicality, and the foot pedals, expression pedal, stop control... And she'll be competing against people who have a diploma in organ, can she get to that standard in time?
And that's before the rest of the responsibilities. In my college (a small one), the organ scholar also managed the choir and the music for concerts and services. Does your daughter have enough experience to coach a choir in choral pieces? That's why most organ scholars have a chorister background, as well as knowing the lifestyle, they have the necessary experience with choral music.
And to add to a pp point, about them "not being as bright". I don't think this is true at all. But they have significantly less time to focus on their studies (due to recitals, choir practice, meetings etc) than other students. That has to have an impact.
It's not a role I wanted at the time, and still wouldn't tbh. But my instrument is purely a hobby