I saw that, and also thought she was alone since, if I'm not mistaken, she's the only one that has a plate and it looks like there's a small amount of food on it.
I didn’t notice the food on her plate... eating all alone!
Or she’s too mean and self-centered to wait for the others to get there.
Or she’s mad they’re late and is trying to make a point.
That’s a big table full of place settings... I think she was stood up by family scheduled to meet her there.