Robin's effusive slobbering over Bon Jovi and now crying when hearing American Nightmare

She's losing it

I guess it's possible that she has terminal diagnosis and her emotions are getting more extreme. And now she's having trouble controlling them

Edit:

Just for the record

1. I fucking hate Robin on the show. I hate her stupid and irrelevant comments, I hate how she was "just going to say that", I hate how she can't finish a sentence without cackling out the last words. I hate everything about her personality

2. Cancer is horrible, and I truly hope that she has not had a relapse. I do not want her to die. I hope she lives a long life...just not on the show