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Pilots are low on jewelry, as well as her SDA church. Jewelry can be dangerous around machinery, engines, can get caught. A plain band ring maybe, but even that can cost a finger..
I didn't notice it before, but you're right. I don't see jewelry in any of her pictures. Although it might be because of the baby...my niece would grab and pull any necklace or earring within her reach, so my sister-in-law stopped wearing any.