I think her bigger mistake was reprimanding someone for aledgedly taking the Lords name in vain because they used profanity. A teller should not be making the customer feel shamed in the normal business days transaction.Like it or not, society has coarsened quite a bit.
Walton Kentucky is a rural county village of about 3000 people. It’s very near Cincinnati, but it has all the characteristics one would expect in a bible belt rural village in Kentucky. Chiding someone for saying “God Damn” is not unheard of, and I’d expect an employee of 24 years to be nearly 50 years old. And, for all we know, she knew the person or their momma or grandpa.
However, I agree with you. That was more overtly religious than saying “have a blessed day”, which in my book is barely religious if at all.