Danica knew Jonathan Archer, the future captain of the Starfleet ship Enterprise, when they were both children. During this time, Archer would constantly chase Danica around her backyard with a plastic laser pistol.
In 2154, she came aboard Enterprise with her father to try to re-materialize Quinn, who had been lost in a transporter accident years ago. She did not approve of her father keeping their real mission a secret from the Enterprise crew members. (ENT: "Daedalus")