Is Sirius Farcbishop of wrath fortuna ?

So I finished s3 and I think it's just my theory Ihavent read LN but Sirius hair are silver nad her ear are pointy like that of an elf and she loves beatleguese so I have theory that she is mother Fortuna. I don't gaf about spoiler so please if it's revealed don't hesitate to answer and I will be starting LN soon anyway