Maija is an abnormal child. She knows too much, is too world weary for a child. Oh, she's cheerful enough, especially when around her twin, but the villagers oft think her a bit... odd.
The reason for this is simple. She remembers a life that is and is not her own. Remembers the tragedy of a young life snuffed out.
She gets another chance, with siblings both older and younger and a determination to see them live well.
She doesn't succeed. She doesn't quite fail, either.
[Or: You died young, Before. You will not see your siblings meet the same end you did.]