Set up an automation rule under Admin > Workflows > Automations > Ticket creation tab > New rule to add a specific tag when a particular email address is in cc of the ticket.
Conditions:
In Ticket > If Ticket CC > is > sara@acmecorp.com
Actions:
Add tag > CC_tag
Go to the Tickets list page, filter out tickets with tag 'CC_tag', to display all tickets with that particular email address in CC.