Person? - Yes.
Mortal? - No.
...from the Third Age? - No.
Halfelven? - No.
Is it an Ent? - No.
Was that person evil? - Unambiguously yes!
Mouth of Sauron? - No.
Was it by any chance a dragon? - No.
Female? - Yes!
Ungoliant? - Sorry, no. (But I see you got my meaning!
)