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You say that you are quite stunned, but honestly, I would not be. If a close relative or friend would ask to me to travel with me on a trip that I would do anyway (and the car is big enough, which is a different matter), I usually would not refuse. It saves a lot of money and hassle for your girlfriend's mother, and is a bit annoying for you, so I would not consider it to be an impolite or rude request.

You can refuse to take her with you, but you cannot do it without hurting her feelings.

You say that you are quite stunned, but honestly, I would not be. If a close relative or friend would ask to me to travel with me on a trip that I would do anyway (and the car is big enough, which is a different matter), I usually would not refuse. It saves a lot of money and hassle for your mother, and is a bit annoying for you, so I would not consider it to be an impolite or rude request.

You can refuse to take her with you, but you cannot do it without hurting her feelings.

You say that you are quite stunned, but honestly, I would not be. If a close relative or friend would ask to me to travel with me on a trip that I would do anyway (and the car is big enough, which is a different matter), I usually would not refuse. It saves a lot of money and hassle for your girlfriend's mother, and is a bit annoying for you, so I would not consider it to be an impolite or rude request.

You can refuse to take her with you, but you cannot do it without hurting her feelings.

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You say that you are quite stunned, but honestly, I would not be. If a close relative or friend would ask to me to travel with me on a trip that I would do anyway (and the car is big enough, which is a different matter), I usually would not refuse. It saves a lot of money and hassle for your mother, and is a bit annoying for you, so I would not consider it to be an impolite or rude request.

You can refuse to take her with you, but you cannot do it without hurting her feelings.