Wow, I am late as forever, but if you are up for backtags, then I've got a couple of thoughts. The main problem is that...she doesn't visually change much, lmao. My first thoughts are he could see her with a sword/fresh from battle from the kinslaying, which would be her past. For her future, the few big things are that she sails West, which I really wouldn't know how to indicate. Or after/during the siege of Lorien, when she tears down Dul Goldor. I imagine that there would be some visible...magic stuff around her. IDK, Tolkien was vague on how she did it.

If you are still up for it, any of those options appeal to you?