The Forgotten Potter

Adeline Euphemia Lily Potter was born 2 years before the boy who lived.
When the Dark Lord murdered her parents, her brother the famed Harry Potter is sent to live with their Aunt and Uncle, but that isn't an option for Addie.
She's a memoria and remembers every minuscule detail of her life from her first word whether it be the temperature or the first line on page 365 of a book. This means she remembers far too much of the wizarding world to be left with a muggle family, instead she is sent to live with her godmother, Alice Longbottom, but clearly tragedy is intent on following her.

For the purposes of this fic, all marauders era is pushed back 2 years so James and Lily were 20 when they had Addie in 1978 and then they had 2 extra years of semi peace and all other things (character deaths in first wizarding war) take place at the same time characters are just slightly older, for example lily and James are 22 when they have Harry in 1980 and 23 when they die in 1981.