she had beencaused是修饰 suffering的定语从句,其中指代先行词 suffering 的关系代词在从句中作宾语,因此被省略,写完整了应该如下：
She should be compensated for the suffering that she had been caused. 她应该弥补自己造成的痛苦.
这句话也可以用下面两个独立的句子表示：
She should be compensated for the suffering 她应该弥补痛苦
She had been causedthe suffering 这种痛苦她之前造成的.