Lost fluffy orange cat named Pumpkin last seen in downtown Ventura County, California.

I lost my fluffy orange cat named Pumpkin in downtown Ventura County while running some errands. She slipped out of her collar and wandered off. Pumpkin is very friendly and usually comes when called, but I haven't seen her since yesterday evening. I'm really worried and want to bring her home. If anyone has seen her, please let me know!