Trinity Ravenscar: Mortal Instruments fanfiction

Mother tells me all living creatures time of death comes, that her time is coming soon and that I have to be ready.
She never tells me why or when , just that I have to be ready. I try to ask her but she ignores me or changes the subject. I love her and I don't want anything to happen to her, she's all I have in the world. My name is Trinity Ravenscar and I am a Shadow Hunter.