It was released on 8 September 2023 through Warner Music Italy as the third single from her eighth studio album E poi siamo finiti nel vortice.

Alicandri stressed that the most interesting aspect of the song are the singer's singing talents highlighted more than in previous tracks, a factor that "historical fans were longing to find again" and that make the single "much more personal and experienced".

[8] Fabio Fiume of All Music Italia also wrote that Ragazza sola is able to "reunite her from an exquisitely vocal point of view with the Annalisa of the past", thanks to "beautiful long notes, sounds full of echoes and fascinating emphasizations" placed on an "electronic structure, ...

[9] Francesco Raiola of Fanpage.it wrote that like the previous singles, the lyrics "retrace the road of loneliness" and there is "repetition play" in the hook, although it turns out to be "more intimate, with the singer's voice simply resting on the piano throughout the first verse" and then becoming a "rhythmic" track.

[10] Claudio Fabretti of Ondarock described "Ragazza sola" as "a song with a more fragile and pensive mood" more similar to Annalisa's early career, finding it "definitely less studied for the charts.