Was her repentance directed towards her methods? Or rather was it directed towards the pride that drove her to ME in the first place? And once there, after an age, to rule? One needs to live in Blessed Realm to have a standard to shoot for, otherwise all you have is a Girdle that keeps everyone out. Whether her magic is parallel, or derives from the same source as Sauron's, her desire to rule and make order (to me) is what needs to be compared, if there is any comparison to make. But, this makes her poignancy much more of a human condition for me.
It seems to me, especially in the 2nd and 3rd ages, that she does see the end clearly. For her, a few thousand years is a fleeting thing. And if Sauron wasnt around marring things, her purpose in Lorien would be less clear. I dont see her regretting using her abilities, nor do I see her regretting the use of Nenya. Her regret reaches back before the sun and the moon rode the sky, when she was a young, fiery, ambitious, talented elf who was adventerous, and got caught up with some doomed Noldor. What was happening in Lorien was the last grasps that delayed an end that was hastened by what Sauron was doing.
all my opinion of course
