Supposedly her grandpa actually had a stroke the day before her birthday (and then passed away a few days later)
I will never, ever complain again about her not tweeting... and some of those Twitter monsters were just being downright NASTY. Hope they feel terrible now. I'm wondering if she had originally planned to say something on her birthday (with the "party" tweet and the mysterious #ARTPOP tweets the day before) but then obviously things changed...