Final answer:
A librarian, given the proper privileges, can usually look up and reset a student's lost library sign-in and password. It's a common library practice, subject to the library's specific policies and privacy guidelines.
Step-by-step explanation:
If a student loses his or her library sign-in and password, it is generally possible for a librarian, such as Ms. Tammy, to look up and reset this information on the computer system. Such actions are typically part of standard library procedures to ensure that students can continue to access library resources. However, specific policies may vary by institution.
A librarian's ability to assist in this matter is based on the security protocols and privacy policies that govern the library's management system. If Ms. Tammy is an authorized librarian with adequate privileges, she would be able to access the system to retrieve or reset login credentials.