I Love Persia!(1984)

Persia ga suki!

11-year old Persia is a young girl who has grown up alongside the animals on the Serengeti plains of Africa. Twins Riki and Gaku Muroi and their grandfather, Gōken, bring Persia to Japan with them, where she will live with a couple who own a grocery store. During the flight to Japan, Persia finds herself in the "Lovely Dream" where she meets the Fairy Queen, who explains that the Lovely Dream is in danger and requests Persia's help. Giving Persia a magical headband that allows her to transform into a teenage girl, connecting her to the Lovely Dream and allowing her to use magic. She is sent with three kappa back into the regular world with the mission of collecting love energy to thaw the frozen Lovely Dream.

(Source: Anime News Network)