My guess: as mentioned earlier, the school in question is (per Lalla Meriem) "a small university in a very, very small town." Said school is something of a "diamond in the rough" - you've probably never heard of it unless you're involved in Catholic organizations (like this Knight of Columbus, for example) or pay attention to certain Catholic media, but it has a VERY high reputation in those circles. For a royal family as private and as Catholic as this one is noted to be, it makes quite a bit of sense.
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Put it this way: if you were a Catholic who thought that the big-name Catholic universities have gone too "secular" (for example, Notre Dame inviting Obama to do the commencement speech despite his, shall we say, wildly divergent position on abortion), you would go to a school like the one Alexandra is attending. For the non-Catholics reading this, the closest (but likely still inexact) analogy I can make to the school's position in American Catholicism is Liberty University (Jerry Falwell's school) or Oral Roberts for Evangelical Protestants, minus the controversial founder and the creepy reputation in general (your mileage may vary on that last one).
Of course, the calculus was likely simpler for Alexandra and the family: good education + Catholic + quiet - big-city distractions (cue quip about Papa Henri's heart here) = best fit. Not that different from the rest of us, right?
