It's
possible she is messing with your account
NF is an old, old, old website - as in ten? years old. It's probably running a rarely updated version of Apache. When a company has a site that works and is making money they often don't want to change it. Which is why NF drops calls and looks clunky compared to TalkToMe's site which is pretty amazing.
Screen shot everything, images of your earnings on twitter, customers being blocked, your argument, everything. Make a nice, readable document that covers everything and lays it all out.
This is a tough one: customer service is slammed and doesn't care, how do you reach a person who actually finds her behavior alarming, and can you trace her back to a NF account.
The real problem is unbalanced people tend to stick around way to long and its not like you want to have a stalker for life. Good luck.