Safari is included with the MacOS so one cannot be updated without the other. I too run an older version of Safari as my OS isn’t the most current. However, Apple still supports my version (El Capitan). She may have a Mac that is too old to upgrade to that version.
----- [updated: 31 May 2022] MacOS: 10.15.7 (Catalina) Safari 14.1.2; Firefox 10.0 PHP 7.4x FastCGI; mySQL 8.0
Alter-Drukarsh Connections 3.3.10b/the Garelicks <family members only>