(I doubt you're qualified to diagnose a psychiatric condition - so let's not toss around "she's a sociopath", specially given that she wasn't the one who refused to obey a simple request, eh?)
She can probably get at least an anti-harassment order against him, since she DID tell him to stop texting and he did not do so. Doesn't matter whether she called him back the next day - she told him to stop. Now, could he use continued contact initiated by her as a defense? Oh, very possibly.
I doubt this would come close to any crime where incarceration would be likely, but he really needs to just stop contacting her. Period. Even if she calls him twenty times begging his forgiveness. This is obviously not a healthy relationship.
Emotional distress is also highly unlikely - those cases are incredibly difficult to prove. It most likely wouldn't be worth pursuing.
Basically, your friend needs to grow up and move on. If she's that bad, she's not worthy of his time anyway. Right?

Bookmarks