Hadith Scan

Abu bakar didn't attend the funeral
It’s recorded in Sahih Ibn Hibban, Vol. 11, pg. 152- 156, Hadith # 4823:

فَأَبَى أَبُو بَكْرٍ، أَنْ يَدْفَعَ إِلَى فَاطِمَةَ مِنْهَا شَيْئًا، فَوَجَدَتْ فَاطِمَةُ، عَلَى أَبِي بَكْرٍ مِنْ ذَلِكَ، فَهَجَرَتْهُ فَلَمْ تُكَلِّمْهُ، حَتَّى تُوُفِّيَتْ، وَعَاشَتْ بَعْدَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سِتَّةَ أَشْهُرٍ، فَلَمَّا تُوُفِّيَتْ دَفَنَهَا عَلِيُّ بْنُ أَبِي طَالِبٍ رِضْوَانُ اللَّهِ عَلَيْهِ لَيْلًا، وَلَمْ يُؤْذِنْ بِهَا أَبَا بَكْرٍ

Abu Bakr refused to give Fatima any of it so Fatima was angry and disappointed with Abu Bakr and she never spoke to him until she died. Fatima survived the Prophet (s) by six months, and when she died, Ali buried her at night and forbade Abu Bakr from attending her burial.