why do people still keep calling her miss piggy

So should we call her Mrs. Frog? I thought they divorced several years back?

She's liberated. She kept her maiden name.

Well, the problem is, nobody could ever confirm if she married him for real or not in "The Muppet Movie," and it was kinda up in the air for 30-some years before he broke up with her in that failed Muppet tv show revival on ABC a few years ago. That, and it's a name that she's been marketed under for nearly 40 years. So it wouldn't matter if she had truly married Kermit, she would still go by the name "Miss Piggy." I've seen it happen to real female celebrities, so it wouldn't be much different for a muppet, if she was real and followed the trends in Hollywood.

Poor Kermit putting up with all that abuse, did her ever take her to court?

She’s a modern sow.