Tell your mother that the study which showed additional heart hazard from naproxen sodium showed no additional risk from Celebrex. Additional risk from Celebrex has only been seen in unusually high doses. If it works well for her, any slight additional risk would seem to be acceptable until there's some much more negative data.

And no one should be taking any pain reliever in extreme doses. I've known people to hurt themselves badly with ibuprofen, for example, eaten like candy -- blood thinning, organ damage, immune system suppression, etc.