She-Hulk was able to enter the MCU’s version of the real world in the Season 1 finale ("Whose Show Is This?"), in keeping with the self-referential and fourth-wall-breaking nature of the show and her characterization.
And yes, She-Hulk can travel to a different universe — the “real world” — and interact with the creators of her own show, convincing them to change certain plot elements in the episode and its ending, altering the reality of the Marvel Cinematic Universe. Her ability to do so is based on the comics, where she was able to do the same.
Gao cites the John Byrne run of SHE-HULK comics for inspiration for this extreme four-wall break, explaining “It felt natural that not only that she was in a show, but that she would have opinions about the show, especially since she just was completely betrayed by the makers of this show. It just felt right that she would go and complain to the ultimate lord of Marvel, which is K.E.V.I.N..”
- ‘She-Hulk’: Introducing Marvel Studios’ K.E.V.I.N. Marvel.com
However, K.E.V.I.N. has said that She-Hulk would not be able to go to the "real world" in the MCU again.
K.E.V.I.N.: You will not be able to access the K-E-V-I-N again.
That error on our platform has been fixed.
Sensational She-Hulk #50 (1993) by John Byrne was the inspiration for the show's plotline, in which She-Hulk interacted with the editors and writers of her own comic book (including John Byrne) and got to choose how her story would unfold.