They do not know. Only Eru does, at least that is what we are told. I suppose I do not know. It is not as thought I have ever met a Vala, our queen was a Maia. Much lesser than the Valar but much greater than us, the children.

I do not think my hair has ever been cut. Nor has it had a problem with insects. Though I have sheltered many a leaf or flower by accident in my waves.