This was an excellent reconstruction of the story, Iliked the combination of Latin and English, but totally misses the original point.
Under Celtic law, Boudica would inherit the estate of Prasutagus but the invading Romans brought completely different laws with them. Under Roman law the entire estate goes to the nearest male heir, in this case the Emperor Nero. Prasutagus seems to have been aware of this and drew up his dubious will leaving half to Nero.
As soon as the Procurator saw the will he knew immediately that it was worthless and went to Norfolk probably to inform Boudica of the realities of the situation. Boudica cannot have been unaware of what was likely to happen and argued back to the Procurator. He lost patience and ordered the Roman Army to deal with the situation.
A rebellion starts but it is noticeable that none of the other British leaders such as Cartimandua of the neighbouring Brigantes joined the rebellion. With two other undefeated legions still in Britain, as things turned outit was a wise move.
There were also several other inaccuracies. Following the usual Roman custom, an earlier Emperor had renamed the city of Londinium as Portus Augusta and there is no official record that it has ever been changed back but it was certainly Portus Augusta during the rebellion.
The refusal of the the other legion to join Suetonius is not puzzling at all. As the commanding officer, Poenius Postumus clearly explained in his letter to Suetonius, an attack was expected in that area. Any officer has the right to disobey instructions if he considers that the local situation makes this necessary.
Also that Boudica "died by her own hand" not necessarily poison. Alive, her fate would have been to have been dragged, in silver chains behind Suetonius's chariot as part of his triumph, before probably being publicly strangled.
Suetonius was not relieved of his command, he was promoted by Nero and sent off to a rougher area now part of Croatia