Regardless, what's done is done. I know personally, I would have handled it a little differently. Does Lena have a right to be pissed? Hell yes she does. But, I would have gone behind the scenes, contacted who I had to contact via facebook, and taken care of it from there. No way would I want countless numbers of people jumping on the bandwagon, giving this obsessed chick attention in any way shape or form. Not only has she gotten under Lena's skin but, now she has all these other people 'tweeting' about her as well. She knows she's gotten Lena's attention ( and most likely David's as well in a way) therefore, she most likely will continue to pull little antics and see just how far she can take this.
Perhaps if Lena would have just ignored her and not given her the time of day, the chick most likely would get tired of not getting any type of reaction from Lena, and just moved on to another poor soul to harass.
Sometimes it's just better to let things roll off your back, roll your eyes, and have the attitude of 'whatever'. Just my opinion ;)