Darcy was raised by her grandmother and grandfather with her four older brothers. She grew up working on and restoring old cars. She worked in a shop from the time she was 9 to the moment she left for college. Jane credits Darcy with the sole reason her crap can still runs.
After hearing that Coulson was having trouble with Lola, Darcy recruited Clint and Natasha to help her fix it without him knowing. They were successful and the new rule is now that: No one touches Lola, except Darcy.