Give your little some space and time. Littles come out when they feel very very safe and know that nothiing will happen to them. I have a 7 yr old who is now (after about a yr) ready to talk and show herself more.
Have lots of paper, crayons, paint, toys, dolls, --what ever attracts little kids. Give her a place to be safe. She'll come out when she is really ready.