Tiffany joined the Big Sisters program because she wanted to be a positive role model and help empower young girls.
The definition of a role model is someone who others look up to, or someone who has attributes and traits that make him a good person to try to be like.
An example of a role model is a famous athlete who all kids want to be like.
a person, esp. one who is unusually effective or inspiring, who serves as a model for others in some social role, an occupation, etc.