Shoot the camera - accept the gift and use it, as it's now not just a simple camera - but a gift of love from your mother.

Do you know what my grandmother used to give all of her grandchildren for Christmas, every single year, like clock-work, and even if we already had one from past Christmas? A lantern-battery flashlight. The old red ones with the rubber button clicker. Yep, year after year.

Be thankful you're getting a camera instead. Just put the packaging in the garage, attic, wherever. It can't possibly take up that much space, can it?

Edit: I just noticed you already got flashlights, hah!