This depends on the intention. If it’s to warn others, this is permissible. If not, this is clearly backbiting.

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Backbiting is to mention the faults of someone while he is not present and slandering means making a false spoken statement damaging to a person’s reputation. If she is seeking naseeha, this does not seem like backbiting. Otherwise, it is backbiting. Kindly refer to the following link(s): https://www.youtube.com/watch?v=5WtAv1nqUH0

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