You never...oh...right. 
As I was reading the various Tokien Wikis, Quenya seemed to be to be the logical choice to me too! Sort of an older, "purer" Elvish from the old Valinor days. Since she's probably considered a Silvan elf, that is, only Eldar in the most technical sense, or of mixed lineage, I can see her taking an interest in the elves that went to the Undying Lands and returned.
I like your idea too that the Black Speech is related to Quenya. It makes a sort of sense too. Quenya was most likely a very common language on Valinor, and could easily have been adopted by Melkor before he escaped back to Middle Earth before the War of Wrath. From there it becomes the "official" language of the Orcs, and over time assumes a unique regional dialect that is called the Black Speech by soft, pasty elves and humans.
So a Quenya speaker could probably work out the gist of Black Speech, though subtle nuances would be lost (which leaves room for learned sages and so on to be consulted when the details are important).

As I was reading the various Tokien Wikis, Quenya seemed to be to be the logical choice to me too! Sort of an older, "purer" Elvish from the old Valinor days. Since she's probably considered a Silvan elf, that is, only Eldar in the most technical sense, or of mixed lineage, I can see her taking an interest in the elves that went to the Undying Lands and returned.
I like your idea too that the Black Speech is related to Quenya. It makes a sort of sense too. Quenya was most likely a very common language on Valinor, and could easily have been adopted by Melkor before he escaped back to Middle Earth before the War of Wrath. From there it becomes the "official" language of the Orcs, and over time assumes a unique regional dialect that is called the Black Speech by soft, pasty elves and humans.
So a Quenya speaker could probably work out the gist of Black Speech, though subtle nuances would be lost (which leaves room for learned sages and so on to be consulted when the details are important).
