An Angel Among Us (Mortal Instruments Fanfic)

Set a pretty long time after CoHF,
Clary and everyone else is enjoying their lives free from Sebastian and all the rest of the evils until the come across a girl living alone on the streets. Both her parents are dead and she is also a shadowhunter. She is no more than 13 years of age, and is a very skilled in battle. Her father was a shadowhunter but she never knew who her mother was. She has her runes but she said soon after she got them, her father was murdered by demons. When they find her, they see that she is no normal Shadowhunter child. She can do more than the rest can, and it may be because of her unknown mother...