I really wouldn't underestimate what you're being told about the sorts of people she is likely to encounter at St. Andrew's (in particular) and Edinburgh and Durham (to a lesser extent).
If she is the sort of person who fits comfortably into very-monied social situations with ease, and is comfortable with either the etiquette or 'eccentricities' (depending on your point of view!), she'll be fine.
If she is the sort of person who thinks teenagers in tweed jackets and red trousers are likely to be loud, obnoxious, pretentious arseholes, she might not enjoy it!
As a native of Glasgow, my fellow countrymen can probably guess my opinion!