Du'a for a mother's happiness

اللَّهُمَّ أَسْعِدْ قَلْبَ أُمِّي، وَاشْرَحْ صَدْرَهَا، وَأَرِحْ قَلْبَهَا، وَأَبْعِدْ عَنْهَا كُلَّ مَا يُحْزِنُهَا، وَأَطِلْ عُمْرَهَا

Allahumma as'id qalba ummi, washrah sadraha, wa arih qalbaha, wa ab'id 'anha kulla ma yuhzinuha, wa atil 'umraha

O Allah, bring happiness to my mother's heart, expand her chest, comfort her heart, keep away from her all that saddens her, and prolong her life.

A general supplication, not a narration from the Prophet (peace be upon him).