In certain cultures it is expected that only females wash the body of females. That is entirely acceptable. Although it is important to mention that your Nikah doesn't cease to exist if one of the spouse passes away.
Infact according to our beautiful religion you become a partner with your spouse in Jannah. Aishah رضي الله عنه was very much a part of Prophet Muhammad's صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ burial process. Even after his death she continued to live in the same area, she moved only when Omar was buried there out of her hayaa.
Shaykh Yahya Ibrahim answers and explains...
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