Never believe for a second that Rome won't launch a re-invasion out of a desire for Veangeance. Even OTL with barbarians attacking from north and east, it took a civil war and the city of Rome Being Sacked by the Visigoths for rome to pull out of Britannia, and by that point the quality of the Imperial decision making had been severely impaired. No way does the Principate let Britannia go it's own way in 63 AD, the amount of roman citizens killed and the province's profitability precludes that notion.
Rome might, after crushing Boudicca, even destroy the villages and towns of the Lands of the Iceni, burn their crops, kill the livestock, and salt the fields, just out of pure spite. They did at least that much to Carthage and they destroyed Arminius' confederation and burned his capitol to the ground after Teutoburg, and that was when they had no intention of occupying Germania afterwards.
Generally speaking, if Rome loses Britainnia to Boudicca, the defeat will be on par with those inflicted upon them by Hannibal and Arminius in the eyes of Rome. Generally speaking, that's not a good club to be a part of in terms of disproportianate retribution. OTL the Iceni were declared a slave tribe, and Boudicca's sisters were raped by the Roman governor. That was why she rebelled in the first place, ITTL when Rome drops the hammer that will seem like light punishment compared what Rome will do to the Iceni.