She began to establish herself as a solo artist with the release of the collaborations "I Know What You Did Last Summer" with Shawn Mendes, and "Bad Things" with Machine Gun Kelly, the latter reaching number four on the US Billboard Hot 100.
Pinih rihin ida magending sareng Shawn Mendes mamurda "I Know What You Did Last Summer" miwah sareng Machine Gun Kelly sané mamurda "Bad Things" tur ngamolihang jayanti kaping pat ring Billboard Hot 100 ring Amérika Serikat.