Border collie mix with blue collar and white chest

I lost my dog Nova yesterday around 5pm. She's a medium-sized border collie mix, about 40 pounds, with a brown and white coat and a distinctive white blaze on her chest. She was wearing a blue collar with a yellow ID tag. She has a small scar on her right hind leg from a past scrape, and she tends to wag her tail in a figure-eight when she's happy. I last saw her near the Copper King Hotel on Harrison Avenue, near the old courthouse, and she might have wandered toward Uptown Butte chasing a scent. Nova is microchipped, and she means the world to me—she's been my constant companion since she was a puppy. If anyone sees her, please text me right away.