I will tell my grandparent's story here, I think it is quite similar and I would like to share it with you.

Sometimes people can't endure the ordeal of the death of a partner, most of them are demolished or totally ravaged by them and is so hard to see when is someone you know, my grandmother survived my grandparent, when he died she had a hearth attack just a few weeks later, it killed off 72% of her hearth in one single strike, she survived because she had a sick son, and wanted to still be there to take care of my uncle (Who lived a long and happy life, thanks to the creator) but remained the rest of her life, all 16 years of it, remembering my grandparent and missing him, it hit her daily and more than once after my uncle became a grown man, she prayed for God to let her leave and join her husband. Eventually she passed away and joined him, and it hit hard to know she was gone, yet she finally was with her Husband.

I think your Aunt not only joined with her husband (Your uncle) in Heaven, but will now enjoy the heavenly life together as a couple, eternally in love.