Fiona actually does reveal who she is?! i'm not sure how her story might close up to the templars but I would assume as an irish goddess she might be relatively welcomed in Àlfheimr. At least she won't be attacked or thrown out.
She got a lot, she totally came around regarding Alex, dropped her hate and I'd even go so far to say she considers him a personal friend. That shows when she says goodbye at the outpost. What more could we expect, her daughter has just got killed. But Titania said she wanted a new connection so there isn't much left to imagination what that might mean... A human-elf child? ^^
This spoiler stuff is silly, btw.