Kamichama Karin Chu Vol 2

From the Del Rey Manga edition

Karin is an average girl--at best. She's not good at sports and gets terrible grades. On top of all that, her parents are dead and her beloved cat Shi-chan just died, too. She is miserable--but everything is about to change. Little does Karin know that her mother's ring has the power to make her a goddess!

Source: OpenLibrary