Five days after the devastating southwest China earthquake, psychological counselors are still unable to tell 12-year-old Liu Xiaohua that she's an orphan.

Playing in the welfare center in Mianyang, Sichuan Province, the girl has been waiting for her parents to collect her and take her home.

But Zhao Guoqiu, a Health Ministry psychological intervention expert, says her mental state is still too fragile for her to receive the news that her parents died in the quake.

Liu, of the Qiang ethnic minority, has been "resistant" to discussing her horrific experiences immediately after the disaster, says Zhao.

The sixth grader was in class at the Qushan Primary School, in Beichuan county, one of the worst-hit areas, when the quake struck.

The building collapsed, but a teacher helped her escape from the debris and she returned home to find her grandmother and her younger brother dead.

Her parents had died rushing to her school.

"This is the most difficult case I have dealt with in 30 years. To see the death of her relatives is extremely cruel for someone so young," says Zhao.

Counselors are still trying to win her trust in order to help her express the grief of that day, but she curls up weeping and refuses to discuss those events whenever the subject is raised.

"Her therapy has progressed very slowly as she has avoided facing reality," says Zhao.

"The disaster has cast a huge shadow in her mind and she can't expel the shadow, it could develop into a serious psychological problem, which could ruin her future or even drive her to suicide."

The eight children in the welfare center are among tens of thousands of people thought to be seriously traumatized by the disaster.