aggressive

hi can anyone give me some advice to help me with my 14 month old jrt bitch she as got aggresive with my other dogs they can be fine one minute and the next she just attacks she is the same when we take her for walks if she see other dogs and they get to close she attacks them now if other dog are around we cant let her of lead .we have been going to training classes since she was a puppy which was good till she was 7 to 8 month old then the growling at the other dogs started i still take her as hoping she would grow out of it with being around dogs but its not change her any advice please

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