I have a rule. If a funeral is inside a church I wear black dress pants. If the funeral is outside or graveside I wear black jeans. I can tell you though that here I have seen plenty of jeans on men at funerals. They’re paired with a nice shirt but it’s still accepted and no one ever mentions it.
Having said that, she just looks sloppy sloppy. Like she didn’t even try.
They are not farmers or cowboys. It is inappropriate attire for the place and occasion.