Faith

I just finished season 7 and I have thoughts on Faith. At first, this change really bothered me that she could possibly be alive but...I don't think she is. I think Fanny's mother will be a different Faith. I feel like bringing her back would cheapen what Claire went through with her miscarriage. The song is the only thing I can't explain. Another traveler maybe? Seems very coincidental but then a lot of the show is. We also don't know what DG plans to do with the rest of the books so it could be part of what is in the cards? It leaves a lot of loose ends to tie up in one season and what would that say of the benevolent Mother Hildegard? I just don't think it'll be true. What are your thoughts?

It's worth noting that I haven't read book 9 yet so I could be missing something crucial.