Explanation

She had got home at 7 when I phoned. She had been at her mother's home.

جب میں نے فون کیا تو وہ 7 بجے گھر پہنچی تھی۔ وہ اپنی ماں کے گھر گیا ہوا تھا۔

The past perfect tense ("had been") 

Had been" shows a past action that happened before another past action (she got home).