When she was young, Abby grew up with 17 brothers, a crazy uncle, and her cousin Veronica. Throughout her childhood, she and Veronica played together and she was bullied by her brothers. Eventually, Abby moved to the Barnyard and met Otis and all of her new best friends.
Abby is friends with everyone, though Freddy's unstable mental health frequently strains their friendship. Abby is also very athletic, allergic to petunias, has an obsessive-compulsive addiction for organizing, and loves cats.
In one episode, it is revealed that Abby has some kind of a double personality, in which she was acting like a very nice and innocent cow, then the other second, she was acting like a strong, rough cow. She seems to be very competitive and very pushy and stubborn at times. She is known to be very rough as seen in one episode that when she said her cousin was exactly the same as her, they were terrified and imagined her doing violent stuff to Otis, Pip, Freddy, Peck, and Pig.
Abby has a crush on Otis, as revealed in Cowman: The Uddered Avenger and she has a love shrine to Otis, though neither of them ever admitted it; however, in "King Cud," the two of them were almost married. In the episode where her cousin Veronica visited and attracted Otis, Pip, Freddy, Peck, and Pig, Veronica said that she would take Otis back with her referring to him as "the big cute one", then Abby got really angry, and said that she has to take "Otis" out of her trance, then Bessy correcting her saying, "Don't you mean all of them?", then she did had an embarrassed-sounding laugh while saying, "Yeah, I mean them."
Abby is a bottle blonde, as it isn't her natural hair color. Although she claims to have wrestled gators, she still gets beaten up by Krouser Krebs. Her hooves are shinier than most. In "Cupig," it is revealed that Abby uses yellow hair dye. It is unknown how, why, or when she joined the Barnyard or what happened to Daisy.