Daughter of the Nimrodel may be over-costed and out-done, but three resources for two healing a turn (barring direct damage) isn't terrible. Pretty much all the other healing allies are better, at least paired with the right trait. But still, she's not terrible, just overshadowed.
Daughter of the Nimrodel
Ally. Cost: 3. 1 0 0 1
Action: Exhaust Daughter of the Nimrodel to heal up to 2 damage on any 1 hero.
"Here is Nimrodel! Of this stream the Silvan Elves made many songs long ago, and still we sing them in the North...I will bate my feet, for it is said that the water is healing to the weary." Legolas, The Fellowship of the Ring
Core Set #58. Lore.