She wanted to know - child it was on the grass.分析句子成分 为什么用wh

She wanted to know,这里是她想知道,
child it was on the grass,孩子在草坪上.
整个句子是一个宾语从句.按照宾语从句,牵扯到人的,可以是who,whose,that等.
后面的从句中,把who和that填进去,就有2个主语了,who和child了,而且中间没连接词,肯定是不行的.而用whose就是谁的孩子.
整个句子理她想知道谁的孩子在草坪上!