[daeron]

Hmm... The light of the star Earendil is that from the Silmaril upon his brow. So one can wonder if the trapped light is the 'Galadriel version' of a Silmaril. Though one must agree that the phial given to Frodo is a very diminished version of the Silmaril.
"We are in the same story after all. The tales never end. Only people come and go as thier parts are over."
Did she have the ability to make the Silmarils herself? I think not. Feanor was unique.Otherwise the two trees themselves would have been regrown.

As to LoTR being a smaller version of the Silm, I don't think so. Silm is a grand tale of 500years. There are many parts in it. Tolkien threw everything at it. There are boind to be cases which seem similar. LoTR is a totally different style of work. It covers just one year. Instances seem similar to Silm because there are so many things happening in Silm. As to the Eagles, they are the descendents of Thorondor and the eldest ones. Tolkien could not obviously leave them out of his tale, could not kill them all out at the end of the first age. Questions will pop up if they are absent. As to Arwen, all lines from the first age continued. So it would be natural to marry them again.