Hmmm....
Maybe it's because I'm not Catholic (but I doubt it), but I don't see anything particularly wrong with that slogan.
You wouldn't want to see "Preparing girls for failure" or "Instilling in girls our tradition of mediocrity", right?
Or perhaps I've missed your point, in which case, sorry for having done so.
What was missing from the school slogan was "...in the Catholic tradition"... - dropped long ago although Catholic schools were originally started for academic excellence AND to instill a good Catholic education, especially here in the USA which was a Protestant country.