How to block iMessages under emails instead of numbers?

So this girl i know got my number somehow and she always adds me to these group iMessages, which i guess i can't just delete myself out of. I don't have a problem with her adding me but she adds like 10 other people and my phone gets completely blown up and it makes it so slow and everything crashes. I've asked her not to add me to those conversations but she still does it! I want to block her but since she's using an iPad for iMessage, she's under an email not an actual phone number. I have an iPhone under Verizon and i was wondering if i could block her under an email or leave the group message or pretty much anything.

IOS 7 when its released is susposed to have built in blocking capabilities for calls and messages. Not sure if it fits your specific need, but you may have to wait for that to be released.

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