Guutara Elf no Nonbiri Isekai Kikou

At the exact moment her body shrinks as the cost of using grand magic, Larart, the guardian of the elf village, suddenly recalls memories of her past life as a lazy Japanese office lady. In the midst of all this, she gives in to her cravings and breaks the village's sacred taboo against eating meat! Banished from her home, Larart sets off on an unexpected journey alongside her doting disciple and a fluffy spirit beast!

(Source: Kodansha, translated)