The girl from the Ant - Man story might also refer to Janet van Dyne. She was the original Wasp. Trapped in the Quantum Realm for years, her existence was a mystery for a long time. Her story is intertwined with that of Ant - Man as her husband, Hank Pym, was the creator of the Ant - Man suit. Her return from the Quantum Realm had a big impact on the overall story and the development of other characters.
The girl in the Ant - Man story could be Hope van Dyne. She is a strong and intelligent character. She plays a crucial role in the story, being skilled in combat and having a deep understanding of the Pym technology. She eventually becomes the Wasp, a superhero in her own right, and fights alongside Ant - Man to protect the world from various threats.