I will say that she was already EXTREMELY popular in
Disneyland. Her show had been on for less than a month at that point and we saw as many little Elena's as we did Elsa's in 2014.... They put her dress in BBB at least the Disneyland and it seemed like a lot of girls chose that one. My husband said "Wow, she's even more popular than Elsa was and the show just started!"
Also, if you watch the show, she is VERY obviously branded as "Latina" but realistically very Mexican.
I think the show will be quite popular for a while.