Covid queues have certainly brought out ugliness in people. Good for you for not saying something.

I love to make people feel worse by saying something really kind like, oh I'm sorry, the way you looked at me I thought you were being incredibly thoughtful and letting me go ahead of you. My apologies.

I'm sure it would've made her feel like a right twat! But hindsight is always a wonderful thing - and like Katie said, it really does depend on your mood at the time.