The Shadow Walkers: The Summons.

The Forngarmo was spending the night in the forests of Bree-Land like usual, but suddenly she felt the teeth on her right leg then heard howling nearby. She woke up reaching for her sword but then Valor, her wolf came closer to her, revealing that it wasn't a threat and it was just him. She looked at him and sighed with relief, laughing at her own temper. She then sat down, wondering why he came to her in the middle of the night as he was never doing that and what's more important - Why he woke her like this.
She sighed once again, shaking her head then decided to fall asleep again. The rest of the night was calm, even the howling of the wolves was more silent than always. As dawn broke, it was time for leave her camp once again and go hunting as her supplies were not enough for another day. She then spotted a letter, attached to the wolf's collar. Galad leaned down and called for the wolf to come closer but instead he ran away. 
Katrandil stood up and tried to get closer to him again. One thing was certain - she needed to get that letter as whatever was written there was important. She knew that not everyone can get close to Valor, as he trusts not many. The Forngarmo followed the wolf all the way out of the forest.
As they reached the main road, the wolf seemed to be calm once again. He sat down and looked at Kat's direction. She came closer to him, reaching out towards him with her left hand. "Come on, Valor. Come to me..." - She said in Quenya towards the wolf. Valor came up to her and laid himself down in front of her, finally allowing the woman to retrieve the letter from his collar. Katrandil put her hand inside the collar, near the wolf's neck, trying to pull out the letter, and finally retrieving it.
She looked at it, it appeared to be written by Halbarad of Esteldin. Katrandil then started reading. 
"I have a need of you, The Forngarmo. And because of it I ask you to come to Amarion's encampment, there you will receive further instructions. I know that I can count on you, sister. Make haste and come there as soon as possible. Stay safe, Halbarad." She got lost in her thoughts for a while after she was done with reading. She then got back to the camp, still thinking.
What is she needed for and why does Halbarad sent for her with such a haste? Is that something about her, a random task or an very important one that only she is able to complete? One thing was certain, she needed to leave again.