I wonder if this is relevant to Lilith’s story

It’s interesting that the necklace Lilith wears in the reveal of the final episode is so different from what she wears in any of her official portraits.

Usually she seems to prefer a pearl necklace. Seeing this “new” necklace, my first thought was that it might be a hint to why she disappeared?

Maybe she traded her voice for whichever deal she made with Adam. Her singing/songs is what made Hell prosper so I wonder if having her voice “sealed“ away - by the necklace?! - was one of the conditions.

This could be why she couldn’t/wouldn’t interfere with the happening of the past 7 years, nor could she contact/speak to her daughter in that time.

Is that feasible?