Short Story Feedback Request: What Works Here?

[Glenn83]

I've been working on a short story about a woman discovering her neighbor is living a double life. She finds out by accident then has to decide what to do. Do she tells his family? Ignores it? The core problem is I'm not sure if readers will care about the protagonist. She's deliberately bland because her ordinariness is the point. But I think that might be backfiring. She feels uninteresting rather than relatable. How do you make an ordinary character compelling? Is my premise interesting enough to carry a story? Should I add more tension or is discovery itself the tension?