Dot and Keeto (1986)

Dot, an Australian girl, seeks the magical green root that will give her the ability to talk to animals. She eats a red root by mistake, and is shrunk to the size of an ant. With the help of her friends Keeto the mosquito and Butterwalk the caterpillar, she searches for the green root that will restore her size. But she must find it before sundown, or she will shrink even smaller.