To find this mob in-game, use BACKSPACE to open the World Search window, then enter Tina in the Search field and click "Search". Remember, the field is case-sensitive and must be entered exactly as shown.
She is on the northwest outside of the bank, with her sister Violet.
The sisters only appear during Double-XP weekends, and not always. When they appeared during the Double-XP weekend of Feb. 5-8, 2016 (Super Bowl 50 weekend), they gave away the following items each day: