Tensei Youjo. Shinjuu to Ouji to, Saikyou no Oji-san Youhei-dan no Naka de Ikiru.

Upon awakening, Yuno finds herself in an unfamiliar meadow. Before her stands a massive dog calling itself a "divine beast," along with a group of brawny mercenaries. On top of that, her body has somehow become that of a little girl?! "I get it now. This must be what they call being reincarnated in another world!" Quickly grasping the situation, she decides to call herself Lezay—and when she tries using magic, she discovers that her abilities are absurdly overpowered! Even while under the protection of the mercenary troop, she wastes no time running wild, setting out to hunt dragons, developing new dishes with tornado magic, and more...? The strongest little girl, a legendary divine beast, and an unbeatable mercenary troop weave together an unprecedented otherworldly adventure fantasy! Source: AlphaPolis