Z visa FOR work experience in China

Hi
I want to get a Z type FOR my 17 year old daughter.
My daughter is student at Cambridge internațional school from România and in june she have to Compulsory work experience for school. Because we have bussines in China FOR more than 10years I want to Take my daughter in China for this Compulsory work experience. The school is very Suportive providing all the documents required for getting the visa( work experience contract with the chineese company, recomandation letter )
I sent all the documents to the consulate to see if I need Any Other document and they Said I need to ask the chineese company the documents FOR Z type
Can you help me to understand What document I need from chineese company to get Z type here?