She's 18, that's why she went to the castings.
But when VS rejected her, they may have used the age as an excuse. She can legally do it, but they think she looks too young for the show.
To be honest, I think that's a silly excuse. VS people were trying to be nice, and she's using it not to say the truth, which is that she wasn't casted. That's why she should stop talking about everything she does on IG.
I like her, but she's too immature sometimes.