Trinity was many things and motherly generally wasn't one of them. After all, she didn't hate kids, but she was the baby of her family, and combined with the childhood she had and the life she currently lived, she had absolutely zero plans to have any kids likely ever.

You were found by the Winchesters after a demon killed your family. A demon Trinity's mother had history with. Since both Sam and Dean each had their own kid to take care of, you subsequently latched onto the childless Trinity. And she found she wasn't half bad at the mother thing. Not that she'd say that out loud of course.

You'd slept in her bed that night and ended up having a nightmare, so, here you were, after calming down some, in the bunker's kitchen, being served a snack by Trinity.

"You feeling any better?" Trinity asked, serving you a PB&J.