@Riki_Iroha (Y/N) du Nord, that's a name I like!
To answer your question. In the previous LWA story, Shiny Chariot wasn't (Y/N)'s mother, even though I understand the similarities between (Y/N) and Chariot. I don't know if I mentioned her name, but (Y/N)'s mother was called Eva, a witch who is still (Y/N)'s mother in the new story, but she died before the plot began.
It's an idea I wanted to develop in the previous version, but I'll do so in my new fanfic, where I'll give the answers to the link between (Y/N) and Shiny Chariot that I wasn't able to give before.