I called someone a name and they heard me?

i called this 11(?) year old child dora because of her hairstyle and she just stopped, stared sadly and continued walking. i didn't intend for her to hear me and my friend was also making fun of her but she didn't hear her. i feel really bad but i can't imagine she would report it. what should i do?
Update: i have anxiety, of course i'm worried about her reporting it. i know i'm im the wrong here. i just worry too much about what could happen.
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