Ashley enjoys the time she spends with her mother, but is arguably the closest with her cousin, Will, who is a huge inspiration to her. Ashley looked up to Will as a big brother and spent much of her time following him in her younger days. Their bond was so tight that in the episode "Will Gets A Job", Will states that if he had a choice to be any of Phillip's kids, it would be Ashley. Furthermore, Will's more laidback attitude in comparison to his relatives proved to be an exciting alternative for Ashley, and because of this, she tends to be generally more sympathetic and understanding towards him than other members of the Banks family. Because of Will's influence towards Ashley, she often acts rebelliously as she gets older, causing her father to become angry at Will for not being a responsible role model. Phillip being the honourable, by-the-rules kind of man he is, tends to discourage Ashley's regular teenage acts of rebellion. However, in the long run, most of his actions did nothing to prevent Ashley from being rebellious.
An example of her rebellion fueled by Will's actions is in the episode "Father Knows Best", which reveals that she dropped out of her private school and secretly enrolled in a public high school. She planned to hide this action from her parents, though after a failed plot when Will posed as Ashley's father in a parent-teacher conference, Will convinces her to come clean.
As Ashley grows older, she spends less time with Will because he becomes overprotective like her father. She believed that she was old enough to make her own decisions in her life, especially when it came to boys, which Will and Phillip disliked hearing and chose not to believe.
Ashley matures very much in the series; she becomes a one-hit-wonder with a hit song called "Make Up Your Mind" in the two-part season five premiere "What's Will Got to Do With It?" and "The Client"; however, her career quickly fizzles out when her album doesn't sell. Ashley also strives to become a fashion model after being discovered by the president of a model agency at her job 'Dippity Do Dog' in "Breaking Up Is Hard To Do".
In the series finale, Ashley decided to attend a performing arts school in New York City. Since Hilary was also moving to New York when her talk show was relocated there, the two sisters decide to live together. They become extremely excited about the whole idea, much to the annoyance of Phillip, who does not want to lose his daughters.
Ashley appeared in 144 episodes of the series.
- One thing in the season 3-6, that she never ages. Mostly she was 15 and never moved up the age for the last 4 seasons.