Calico cat with white chest near City Creek Center

I'm really worried — I lost my calico cat yesterday around 6pm near City Creek Center in Salt Lake City. She's a medium-sized cat, calico with orange, black, and white patches, bright green eyes, and a pink nose. She wears a pink collar with a small silver bell, and there's a tiny white heart-shaped patch on her chest that makes her easy to spot. I last saw her by the outdoor mall area near Main Street, and she may have slipped into a side alley behind Nordstrom. She's my daughter's cat and has sentimental value; I'd be so grateful to get her back if anyone has seen her.