Theodosia: a Steven Universe FanFic

Theodosia is a human, a broken and lost human. Her parents disappeared during the night, leaving little Theo to fend for herself. She managed to find her way to Beach City.

Theo met Rose. Theo was just a young girl when she began to be Stevens babysitter when Greg was working at the car wash, and when the gems were away busy. She watched Steven grow up for years until he was 7, until one day she disappeared. She was only a distant memory for Steven now but now and then he'd think of her.
Steven is now older and aware of his powers and what he is. Theo come back with amazing stories for Steven and Greg. She knew what he was and was amazed. The gems are uncertain of Theo after not seeing her for years and think that she might reveal too much about Rose. After all Theo knew almost everything about the gems which is the reason why they are unsure of her. Theo joins Steven on his many adventures throughout his life, gem and all. But there is something that Theo is keeping from everyone about Rose.

(Please try not to think about ages too much; also you may get the mini references in this...Hamilton....)