She’s not pretending to be a sister and daughter,she is related to her brothers and dad the only thing she is pretending about is her mental age. She was literally reborn as a newborn baby it wasn’t like she hijacked someone’s body and for all we know the people that are responsible for the casting of the magic circle that caused her to be reborn could have intended for her to be the third star.
True. Tbh I wish until the end she remains as Estrella and that she actually died in her previous life. They just showed that she disappeared right. The means there is a chance where they will show that she can go back. I wish she becomes a mage as Estrella and with Wolf fur as King to his native place they will both rule together.

My issue with this is I feel a little weird that the archmade is pretending to be their sister/daughter I dropped this a while ago due to that. I feel a bit more accepting if its like someone without parents or reincarnated then a super old mage with strong powers? Seems a bit more weird to me.