Her main ability, which triggered when Jubilee attacked her, was to disintergrate into nanotech defensive insects that instictively sought out their attacker.

Daria couldn't stand to see Jubilee tortured by Bastion because, as Jubilee reasoned to her, they were both "freaks."

Daria flew Jubilee out of her place of detention, which was the New Mexico Base called "Hulkbuster Base."

Daria flew out of sight, determined to keep the Sentinels distracted as Jubilee got away, which is the last time she was seen. It's unknown whether the Sentinels finished her off or if she somehow got away.