Reading back over this WFTV report,below, to me it sounds like some of her e-mails were accidentally sent to KB and when KB sent them to the FBI, Cindy claimed her e-mail had been hacked. Even if someone had "hacked" her e-mail, the IP where the e-mail originated would read Cindy's home, if indeed she did send the e-mail from her home. If it was sent from someone else, their IP would be connected, unless they used a proxy. At any rate, it would be pretty easy for the FBI to figure it out, IMO. The folowing is a snippet of an WFTV article on the "hacking".
Kathi Belch received four of them on Friday. One of the emails involved the Caylee hairbrush story Eyewitness News broke last week. It seemed odd that Cindy would send Kathi such apparently personal and sensitive information.
Kathi text messaged Cindy right away and forwarded the emails to the FBI, which is already investigating an allegation that Cindy gave investigators the wrong hairbrush when they were trying to get a DNA sample for Caylee.
Cindy told Kathi she had not sent any emails and Monday said she had been locked out of her account over the weekend and said Yahoo found someone in Ocala who might have gotten in.
http://www.wftv.com/news/18181289/detail.html