Wedding invite pressure

My cousin is getting married next week, And I kinda feel like they are pressuring us to go. My mom just passed away recently. The wedding is almost exactly 3 weeks from when she passed. We don't have the money anyhow. We told them this, and the wedding is 4 hours away. I wanted to go before, but now that my mom passed I don't feel like going to a wedding I won't enjoy it anyhow. My mom just passed away