As for interpretations, i rekon this would be useful:
Bauman tells us that Agrippina the Younger "had one supreme ambition, to place her son Nero on the throne: 'Let him kill me, but let him rule'. But not far behind that was her determination to secure a position of unprecedented eminence for herself." In regards to this, the many different sources are in agreement. However, the circumstances of Agrippina's rise and fall are interpreted differently by different historians, reflecting bias present in the work of the different historians and their respective contexts. The constant theme in the end is the perception that she, according to Tacitus possessed "…dictatorial, feminine excess of ambition" and that, Syme asserts, she was "Prepared…to wade through slaughter to a throne."
Tacitus is hostile towards ambitious members of the imperial family and his interpretation of Agrippina's history is evidently influenced by his misogamy: adjectives like "immoral", "disreputable" and "violent" in describing Agrippina. He however also shows some admiration: "…this was a rigorous, almost masculine despotism ". Judgment – although he is bias against women with ambition, he paints a fairly accurate history of Agrippina, occasionally admiring her influence. It should also be considered that he had access to her memoirs.
Cassius Dio – understands that much of the sources on Agrippina rely on gossip and speculation, however is still hostile to her and stresses her immoral seductiveness, firstly with Claudius and then Nero. However, like Tacitus, takes note of as well as admires her powerful influence and achievements. "she had more power than Claudius himself….a fact that was entered in the records."
Ferrero – unique reassessment of the role of Julio-Claudian women in wielding power. Stripped away bias of likes of Tacitus: "Agrippina brought back into the state the authoritative vigour which the nobility had considered the highest ideal of government."
Barrett – evaluates the different interpretations, takes a somewhat middle ground – and his eventual judgment is that she is a woman should be admired for her achievements and the influence which she gained.
Try to write 4 paragraphs(+intro & conclusion) with 2 modern n 2 ancient historians and basically say what they think of her and importantly use direct and straight to the point quotes and you shud be fine. Also, even if you dont agree, try (without using "I") to make a judgement as to the best interpretation.