Should i confront my cousin if I'm only suspecting her?

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My email was hacked last October, and the hacker, using my account sent, a malicious emailto a friend and forwarded to my husband. The email says i am cheating on my husband and i am just after his money, which God knows are not true because I love my husband so much. Luckily, before any damage was done to my marriage, my husband told me about the email after two weeks of receiving it, I was too shocked for this character assassination! and though he was so upset about it, he couldn't believe it either. When i explained that i was not behind that email and everything it contained are not true, we just brush off what happened. I am suspecting my cousin because the secret password to my yahoo mail is my father's middle name, and of course she knows that, our fathers are brothers!Also, all other clues lead to her. When we saw each other after the incident, she couldnt look at my eyes and was too cold on me. So, what do you think? Should i just confront her and ask her if she did that?