Saeril looked at the wizard, then back to Bilbo, just as soon as he told the group that there was something else lurking around in the woods. "What did it look like? A bear?", she asked the Hobbit, making sure she knows what he thinks. Unlike the others, she didn't express any stiffness to her. Between her and Gandalf, they knew what creature the Hobbit was referring to. 

Bilbo looked at the older she-elf curiously, surprised that she could guess so easily. "Y-yes. But bigger, much bigger.” 
Bofur was liking this less and less. “I say we double back", and then there were murmurs of agreement. “And be run down by a pack of Orcs?”, they didn't have many options here, though Gandalf did mention a house where they may take refuge. “Whose house? Are they friend or foe?”, Dwalin questioned, and then suddenly a loud roar ripped through the clearing. Saeril slightly jumped at the roar of a giant bear. It was indeed Beorn. "We don't have a choice", the wizard silently answered himself.

And then, they were running. The roar was getting closer until there was indeed a house in the distance. The she-elf's cloak was only dragging behind her a little bit, but it wasn't that long, so she didn't have to hold it up while she was running. A few times that Kili or Fili tripped, she or Yavanna would pick them to get them back on their feet.