How would you describe Portia’s behavior in act 2 Scene 4?

Portia remarks to the audience, "I have a man's mind, but a woman's might. / How hard it is for women to keep counsel!" (2.4.7-8). She is alluding to the fact that she knows what Brutus is planning to do to Caesar, and is unwilling to keep it a secret. The soothsayer who previously warned Caesar sees her and speaks with her, informing Portia that he will try to once again warn Caesar about his fate.