We got back some photos we had taken of her

=We got back some photos which we had taken of her.

解析：which  we had taken of her为关系代词引导定语从句，关系代词代替先行词some photos并在定语从句作谓语动词had taken 宾语成分。相当于had taken some photos of her。

(1)get back sth=get sth back 取回/找回某物

 You have 14 days in which you can cancel the contract and get your money back. 
 你有14天时间，在此期间你可以取消合同并收回你的钱。

(2)take some photos of sb/sth给某人/某物拍摄一些照片

You must have special permission to take some photos of these paintings. 

你必须有特别许可证才能对这些画拍照。

Many visitors take some photos of the female staff wearing ethnic Korean gowns. 

许多游客给穿着朝鲜族礼服的女工作人员拍照。

继续跟踪解答如下

Of能和which一起提前吗？we got back some photos of which we had taken her.

of which不可以提前，因为some photos是had taken宾语，而of her是介词短语作photos后置定语，即修饰名词photos