Hey Herb,
I like the tone of her voice a bunch, she sounds like a great vocalist. As you have mentioned though, I can't make out hardly any of the words that she is singing. I am not sure why that is; seems like they should be easier to understand, even with her breathy vocal style. I am guessing it is just a poor recording of the vocal take.
Cian has great ears; I am not picking out the artifacts, but I often have trouble hearing those types of things clearly. Especially off these cheap computer speakers at work.
I like the song for the most part. I would probably like it better if I could understand the vocals or had the lyrics. It does have a little bit of that BIAB sound going to the backing tracks. I think it would definitely be worth finding another singer to take a stab at the vocals if it meant they were better recorded and easier to understand. The song sounds like it is a keeper.