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A woman visited her neighbour, who was out. And her neighbour's son opened the door. She introduced herself to the son, "I am a friend of your mother's".
If I were the woman, I would said, "I am your mother's friend". It seems more concise.
That is a commonly used way of saying this. It carries an implication of being one of many/several friends, whereas your alternative, equally valid, is more specific and seems to imply that you are the only friend.
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That is a commonly used way of saying this. It carries an implication of being one of many/several friends, whereas your alternative, equally valid, is more specific and seems to imply that you are the only friend.
A friend of your mother's 
Re: A friend of your mother's 
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