Jehovah's Witnesses tend to believe they are above the law because "they obey god as ruler rather than man". This fact and its implications are VERY important in the medical situation.
This persons actions already showed that they can not be trusted with confidential issue since they couldn't even act professionally at the very fundemental level of their job (receptionist = greeting patients/clients). If the company is unwilling to remove her from this position, I would proceed with the human rights violation complaint. Just my opinion.