Well.. I guess I understand the situation, and have an idea how it comes from..
Though, something I'm curious about, I don't recall seeing it, but, did you happen to stay in contact. It would seem that you lost contact and truth be told, you lost contact for your reasons, some couples, even after going through hell and back can remain in contact, despite all that happens.
..But, something tells me just maybe that wasn't your case. You guys lost contact for a reason. [If I'm wrong here, then you probably wouldn't have asked for advice and have already added her.]
..But, then it comes down too, what kind of myspace page are you holding? If it's something like myself, just some random page of randomness and you're not doing anything private or hiding people. I could see very little harm outside of trouble being caused. So maybe do your research you know? It's like buying a car or something big, you don't want to go into it blind.
But really, unless you're hiding something, it shouldn't be a problem unless you allow a reason for it to appear. Really, only you know deep down if you want too or not. Just don't let the idea of her --friends-- sending mails bother you, remember, their her friends, they're gonna take her side just who she is, like I'm sure your friends would.
Have you happened to check her page out? See what's going on in her life, if possible, make sure this isn't some sort of odd.. "well I was happier with him..." sort of deal and some insight