Could be a standard clip-on case with a custom paint job. The protrusion above the mute switch could just be an illusion caused by the viewing angle.
Not stalkerish unless you tweet her while staring in her windows LoL. Def tweet the pic and question to her. She may answer since you aren't begging for a follow or RT iPhoneMommy "Be nice to people on your way up because you'll meet them on your way down." - Wilson Mizner
I'm sure she will answer or even give the case to u with her autograph..... That would be sweet !! 😁
I did send her a tweet a few days ago, so far nothing. I even tried asking her on Instagram after I noticed she posted something! :-(