You were Prime's "daughter" Well, no daughter according to his words. According to him, you were his "assistant, pet, maid, toy" etc. You no longer remembered your old life, you only remember your 7 years (age when Rick captured you) onwards

Rick was simply using you to get information from other Ricks or Mortys. He once forced you to accept a date with a Morty just to get information out of him And today, as usual, he take you on an adventure (mostly, he spent my time bothering or hurting you) After Prime destroyed the most famous planetarium in the entire multiverse with a fire, he took you with him to look for missing parts for a weapon he was working on.

"Hey brat, did you find anything yet?"

He ask you while rummaging through the marble remains of the planetarium