اَللَّهُمَّ اغْفِرْ لَهَا وَارْفَعْ دَرَجَتَهَا فِي الْمَهْدِيِّيْنَ، وَاخْلُفْهَآ فِي عَقِبِهَا فِي الْغَابِرِيْنَ، وَاغْفِرْ لَنَا وَلَهَا يَا رَبَّ الْعَالَمِيْنَ، وَافْسَحْ لَهَا فِي قَبْرِهَا، وَنَوِّرْ لَهَا فِيهِ

Allahumm-aghfir laha [mention the person's name] warfa‛ darajataha fil-mahdiyyin, wakhlufha fee ‛aqibiha fil-ghaabireen, waghfir lanaa wa laha yaa rabbal-‛aalameen, wafsah laha fee qabriha wa nawwir laha feeh

O Allah, forgive – [so-and-so] - and raise her rank among the rightly guided, and be a successor to whom she has left behind, and forgive us and her O Lord of the worlds. Make spacious her grave and illuminate it for her.

Reference: Muslim: 920