You’d think they’d just excuse her and move on to someone who’s just gonna show up without going back and forth with them trying to get out of it.

I’m not blaming OP by any means, I think it’s BS they won’t just excuse her because her reason is valid, but I’m thinking from the clerk or whoever’s perspective. If it were me I’d be like “well this person’s making more work for me by arguing, just toss her.”