Silver pendant necklace with heart charm

I lost my silver pendant necklace yesterday around 3pm near the Mattoon Public Library on Main Street, in the Mattoon-Charleston area. It's an 18-inch sterling silver chain with a small heart pendant about the size of a fingernail. On the back, the initials 'M.K.' are etched faintly, and there’s a tiny flower engraved on the front near the bottom. The chain shows a little patina from wear, but it's still shiny in the light. This necklace was a gift from my grandmother and means a lot to me; I’ve worn it almost every day since she passed. If anyone found it, please drop me a message—I'd be forever grateful to get it back.