Should I keep quiet, or tell her her zipper was down?

I saw a very tall colored girl at Wall mart yesterday. She was an employee there, and her zipper was all the way down and gapped open. I walked over very close to her and told her it was down. I am sure she was horribly embarrassed, but she pulled up her zipper. I have seen this sort of situation before, zipper down, a breast exposed, etc. I am always torn. Do I tell the girl and embarrass her, or keep quiet and let her find out on her own?
Tell her even though it will embarress her.
Let her figure it out for herself.
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Should I keep quiet, or tell her her zipper was down?
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