From experience, a lot of people will turn up with bikes, most won't use them at all, those that do use them the majority won't bother locking them. So some security makes use of the one eyed man is king metaphor. Ours had an integral wheel lock on the bike they took which was really useful (like the one linked to on page 1 almost definitely) and didn't lose the bike in 3 years use mainly relying on a Knog Party Frank (which looks wimpy as anything to me, but they refused to carry a heavy chain around) and the wheel lock. The bike lived inside from the second they were out of Halls, which was a couple of months in to the first year because they hated halls.
Again, the bike didn't look special (the mixte we have bought very second hand from a local guy who does up bikes and sells them from his driveway for charity) and it had no maintenance done to it to make it any better, although the single speed and the hard tail Commencal also saw use at Uni and still managed to stay un-stolen. Also no maintenance at all except the times they came home. Nothing special on tyres, I don't think there were many/any punctures, but if they were they walked the bike to an LBS and paid to have it sorted (students, loads of disposable time). The mixte had a pair of new continentals on it but nothing special.
If you are going N+1 (which sounds unlikely) then wait until you know the distances and consider a town bike as it'll be set up to cope with having nothing done to it for ages and will be enough bike for her to pootle around on.