Why could she be certain of that? And why can you be sure that there will be a future resurrection that may include your loved ones? There are good reasons for your conviction.
وَمَاذَا يُؤَكِّدُ لَكَ أَنَّهُ سَتَكُونُ قِيَامَةٌ فِي ٱلْمُسْتَقْبَلِ وَأَنَّ أَحِبَّاءَكَ يُمْكِنُ أَنْ يَقُومُوا مِنَ ٱلْمَوْتِ ؟‏