Dark phoenix Twins

what if Harry Potter had a twin sister but no one knows of her other than James,lily and there tight group of friends consist of Sirius Black , Remus lupin ,Ema scamander and krish Silverstorm. what will happen when his sister starts the journey of finding her adoptive and biological parents and join forces with other students in Hogwarts and uncover the truth behind the wizarding war.
will they be able to save the magic world are be the reson for it's fall.......

all the rights are reserved to JK Rowling except for the story plot and oc.
The pics used are not mine credits to the real owner

This is my first story it has different timeline than the canon because of the plot