Why Nancy would draw...
Nancy without a clue.
Nancy ended up with daddy issues... Because mommy made her cry so much that she ran out of tissues.
Mommy told Nancy she was the reason Daddy didn't stay... The though of him not wanting her ruined her every moment he was away.
Nancy then grew up seeing Mommy hurt and cry. And there wasn't a single relationship Mommy came across that wasn't based off of a lie.
And that is why Nancy drew Because when it came to showing her true emotions, Nancy really didn't have a clue.