I believe I have a real libel case.

I am a widow, and my husband committed suicide over a year ago. My boyfriend's ex is making posts on her blog stating that I am stalking and harassing her (I emailed her twice to tell her to leave me and my boyfriend alone). She has also stated that I "had something to due with my husband's 'suicide' ", that my "husband died under mysterious circumstances", and that she is afraid I will kill my boyfriend. Her posts are password protected but I was given the password... and several people have seen and also commented on these posts. She has also used my real name on occasion.
I have copies of all the posts. Can I sue her for libel? If so, how high do you think my chances of winning the case are?