She would have faced the difficult prospect of defeating a second roman legion and an auxillary legion, who woud be marching east as quickly as possible from the Silures tribal land to prevent her from destroying any more valuable settlements. The first thing that would no doubt happen is the commander of these forces would urgently request reinforcements.
Nero did send additional men to aid Paulus Suetonius in quelling the Britons after he had defeated Boudicca. Tacticus writes:
'The emperor strengthened the forces by sending from Germany two thousand legionaries, eight cohorts of auxiliaries, and a thousand cavalry.'
Whether he was being accurate is debatable, but I'd reckon it would be enough to prevent Boudicca from doing much more damage.
However, this would leave the Silures and their neighbouring tribes in control of their lands, and the Iceni have managed to prove a very powerful point. Mismanagement on the part of the governor isn't particularly popular. Perhaps the Romans decide that it might be better just to install a new governor and try to retain the foothold they still have. Better treatment, some form of compensation and more autonomy might coax the Britons out of their fury. Perhaps the Romans stick to romanising more of the native tribes instead of conquering them outright.