I think the dispute is the definition of "mainstream".
The Rock & Hulk Hogan are beyond mainstream, they're American icons, which is on another level.
To me, mainstream means do people who not watch wrestling know who they are.
And to me, with her being related to who she's related to and some of the projects she's already done (Star Wars, New York Fashion Week), she's already kind of a mainstream star. You already see her hanging out with real celebrities all the time
If she did something like "Dancing With The Stars" or got a part in a Hollywood movie, I'd consider that mainstream.
It's not Dwayne level, but it would mean that TMZ would cover her whenever she was in L.A., which they already kinda do.