Looking more into my Alter

I don't know where she came from. Just on Monday she appeared in my head and just said she was in a deep sleep until 5 months ago for some reason. Rin told me something but I forgot. I don't know exactly and there are mysteries on where she came from that I don't know. I have a hunch it was about grief because she awaken the day we had my Grandma's funeral. Rin told me it was something more than that but not to worry about it as she would protect me. I need help into figuering out her origins. Please and thank you.

I want to thank @QuietMagic for introducing me to this community.