[Nerwen]

Correct on #3 and #5. Pervinca, you're almost there with #1, but you need, not Lalaith herself, but the thing for which she was named (and which translates roughly to "laughing water").

1. Namesake of Hiawatha's beloved gives name to another doomed maiden.
2. It is rich, yet a disfigurement.
RINGLÓ: Call softly; it is cold.
4. I'm addressing you- bow your head deeply. Shepherds bathe here!
GLADDEN: Cheer up flower!