Saeril too noticed Bilbo trying to sneak by, just by the time she heard Yavanna mention about the young Hobbit. She nodded about his decision to return to his home back at the Shire, also nodding once more at his respects for the deceased Sons of Durin, before he made his departure. She didn't bother to read his mind, considering that she didn't need to, when he already expressed his sorrow from earlier. 

Having to watch the Hobbit walk away, the winged she-elf looked in the distance of what may lie ahead. She didn't know what exactly, but considering her earlier 'episodes', there might be something lurking beneath them at this very moment. She didn't want to tell them, in order to prevent fear, panic, or skepticism about the Elder as a person. It was just the three of them now, having to now be on their own, for this part of the journey...