Saeril was still looking at Yavanna, having to know that Legolas' thought traveled all the way to her. The elder gave her a reassuring smile. "Oh, just heard something is all. Something that nature told me", she then looked back up at the stars. "They're saying, that Legolas wishes you to be safe. And, that he will come, in search of you", she basically translated the thought that she received from the Elf Prince, knowing that it will give the princess some hope that, sooner or later, he will return. With that said, she reached over and place a comforting hand on her forearm, having to give the girl a reassuring sign that everything will be alright between the two of them. 

Though he may seem to be far away, he will never forget her face, or her presence. Legolas made it clear: he will return, and see her again.