I guess it's either a hit or miss.
She's actually not very religious, but she does consider herself a Christian. She's not too conservative, and she's slightly modern. For example, she gave me a Victoria's Secret gift card for Christmas last year, lol. The question I should've asked was if a sideways cross necklace is too edgy for a woman in her 40's.
I actually placed an order for a small silver one for her, because I thought it was more age appropriate. But after reading the comments here I got strong second thoughts again, so I changed the order to a gold one for myself
Thank you all for your opinions!