One new detail is that it was a Hotmail account. So, it would be someone who knew about the account and either knew the password, was able to guess the password, or knew enough personal details about Maria to be able to persuade Hotmail's password recovery page to reveal it (as happened to Sarah Palin last fall).
It's also possible the person got access to her computer, in which case the password would probably be found in her browser. However, she's claiming, contrary to earlier reports, it was not another boyfriend, but she strongly suspects who it is, but can't name the name.
This sure smells like a setup and trap.
The leaked emails from the lover? Right! Right out of the KGB playbook. Wonder how much DNC paid for the whole show?