Yesterday we had to put my 3 month old bunny Dora down as she had a nasty, complicated leg break. Her sister Daisy has obviously had a big change now that Dora isn't around anymore. Today she has suddenly become very quiet and more timid than usual, even flinching away from a hand offered to her. Last night she pooped normally and ate her breakfast normally, and she grazed all day today. Now we have her inside in her hutch to try and keep her company but she is hiding in the nesting compartment huddled up in a little ball, and is refusing her favourite food (parsley). Is this grief, or something to be more concerned about?