Lost Terrier Mix: Help Find Ellie!

Ellie was staying with my parents while my husband and I were out of town. While walking the Ice Age trail near the hometown days fairgrounds, Ellie got spooked and pulled out of her harness and took off. She is a terrier mix, around 40 pounds, brindle in color with white on her chest and paws. She is a very sweet dog but very shy. She will likely run from strangers.