But why would a librarian need a pager?I believe she is a Librarian.
Librarians can use pagers for everything. That said, most libraries use pagers for customers when an internet terminal is available.
Actually I've been working as an archivist for the past year, like a librarian but for unique historic documents. We have a card catalog of all of our collections in the research room. I use a pager when I am the back-up archivist on reference duty and they need me to go pull something out of the stacks for them or need help on the desk. I actually love our card catalog and prefer it over our online catalog!