Based on our visit to the college tour, we learned that the colleges she is considering (Oberlin, Smith, Mount Holyoke, etc.) provide campus-wide W-Fi. There are no Ethernet ports in the student residence rooms to connect a wireless access point or router. For the Apple Time Capsule, it could not be physically connected to a router or an Ethernet port. It’s also not possible to connect the Time Capsule to the campus Wi-Fi as a Wi-Fi extender.
The bottom line here is that the Time Capsule has been designed to connect permanently to wired Ethernet, college residence halls do not have Ethernet, my daughter will need an external hard drive to use with Time Machine.