The concerted effort to Make Noah Cyrus Happen began in earnest a year ago with the release of “Again,” an ill-advised and limp collaboration with the controversial rapper XXXTentacion. Like her sister Miley before her, Ms. Cyrus was aligning herself with hip-hop, though unlike Miley, she did not appear to be having any fun. That alliance was just one of several Ms. Cyrus struck — an incomplete list of collaborators includes dance music producers (Marshmello and Matoma), pop singers (MØ), rappers (Lil Xan) and R&B singers (Gallant, Labrinth) — with Ms. Cyrus adjusting as needed to the circumstance.

Around the same time Ms. Cyrus released “Again,” the teenage rapper Bhad Bhabie — then better known as the pottymouthed viral star Danielle Bregoli — released her debut single, “These Heaux.” Unlike Ms. Cyrus, Bhad Bhabie did not come from musical royalty, but she was, it turned out, extremely adaptable. Her claim to fame was a bad, snappish attitude, and molding that into the form of rap verses turned out not to be that much of a leap.

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And so the Bhad Bhabie on “15,” her debut full-length release, and the Ms. Cyrus of “Good Cry,” her debut EP, are both inventions of a sort. But what’s most notable is how relatively natural and at ease Bhad Bhabie, the nonprofessional of the pair, sounds as compared with Ms. Cyrus. Both are bolstered by oodles of professionals, but only Bhad Bhabie remains distinct.