Do all pitbulls get agressive wen dey r older?

I have a 6mnth old pit and i feel her already getting agressive around my other dogs, and wen i try to decipline her she trys to 'attack' me and aims fo the face, im juz wondering if dey all turn agressive? Bcuz my mom is gon put her down wen she older if she turns out to b agressive.