Crazy lunatic on Facebook. Two questions?

[Diva]

I have a couple of questions. I am dealing with a lunatic on Facebook. I have blocked her from all contact (Or so I thought) and a couple days ago, she messaged me on another facebook account that she created. By the time I read her message and attempted to respond, she blocked ME. I was a little confused though, because when I tried sending her a reply anyway, even though fb notified me that I wasn't able to send her a message, it said that she read it. Is this even possible? I'm really frustrated.

Facebook also has an option of selecting "Unread" in which I have researched but what is the point of having that option if the other person still knows that you've read the message? wtf? Can someone please educate me with this BS? Yes, I am old enough to avoid these types of situations but I just want to find out anything else, if possible.

[abraXus]

stop opening the messages from people you dont know - you should not even be notified of messages like that unless you changed your settings to allow strangers to send you messages - report duplicate accounts before you open the message