Saeril felt the girl's hug and, in reaction, she returned the favor by wrapping her arms around her; one hand settled on the back on her head, with the other on her back. However, unaware to the princess, the elder felt that same pinching headache that she felt back in Greenwood, causing her to make a silent wince of pain. Strangely, it disappeared, as soon as it came. 

After a few minutes of their warm embrace, the elder pulled back from Yavanna, quickly composing herself from what she just recently experienced. She didn't, and couldn't, tell the princess for what happened because the last thing they need is to worry about something else, other than Kili.