Unfortunately not. The three accounts of Boudicca's revolt come from two Roman writers: Cassius Dio and Tacitus (Annals and Agricola). The Annals gives the longest and most detailed story, although some details are contradicted in the other two.

That's all there is really. There was not tradition of writing in Britain before the Roman conquest so no native voices survive for us to compare the Roman narrative. There's the archaeology, for example the remains of the Temple of Claudius in Colchester and evidence of burning in St Albans and London. The caveat with the archaeology is that you really need to text to link it to Boudicca. It confirms some details of the story but doesn't always add a whole lot.