In an example: Ma mère m'a acheté une robe ________.
Can't you use either nouvelle or neuve?
You could say for instance -
Ma nouvelle voiture est une voiture neuve = My new car is a brand new one
but I can't think of many examples when you would use both in the same sentence .
In the case of your example
It has to be 'neuve' as it comes after the noun.
Hope this helps!
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