As to the second idea, I don't really see how it could have been Melian, as the Ring hadn't been forged at that point.
I also don't think she had the power to communicate with the Valar through her mirror, because to me it seemed that you could only see things that could/were/had happened. It wasn't like a palantir.
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'It must often be so, Sam, when things are in danger: someone has to give them up, lose them, so that others may keep them' ~Frodo
"Life is hard. After all, it kills you." - Katharine Hepburn
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