Some of her franchise sisters shared their commiseration, with Lisa Rinna commenting simply, "NOOOOOOO," while Kyle Richards added, "I absolutely cannot."
Mellencamp quickly proved that she's not letting the injury slow her down, showing herself walk (in the Amazon boot) out to a stunningly gorgeous view of the ocean, and later still getting her workout on, lifting the boot high into the sky.
The reality star also took advantage of the extra downtime in her life to answer some questions with her fans in a subsequent post, including whether or not she'd be interested in a return to television.
"You are lovely and I'm sorry you're not on "Housewives"; you were my favourite, so down to earth," wrote a fan with the handle yellowflowers1243. "Would you consider your own show?"
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"I don't wanna bore you, but I figured I could give you a little update about what's going on," she cheekily started her Instagram video confirming her departure.
"You heard it here last," she captioned her video. "Yes, it’s true, I am not coming back to 'RHOBH.' Thank you Bravo, Evolution, Andy Cohen, and all of the amazing women for the support (and the shade) for the past three years. Back to the shadows I go."
As for why, Mellencamp speculated to Us Weekly that maybe "it's because you didn't see a lot of me, other than in drama this year."
"If you only see me when I’m in an argument, it’s hard to see the whole picture," she continued. "I wish we could have seen more of the fun stuff but it’s a TV show."