Jungle
You can search for members via email address all you have to do is check that option on this page:http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&action=mlist&sa=searchMake sure you type the Username or email to its exact. If you can't find her via email it could be because she registered under a different email address.
Hmm I don't know then. If it's urgent and you really need a way to contact this friend and this is the only way maybe you can message one of the mods or admin about it. I don't know if they'd help you with this kind of thing but it's worth a try. You can private message one of them from here:http://www.feral-heart.com/index.php?option=com_content&view=article&id=28&Itemid=52