just recently, in case no one seen it...
there's a special scene of her introducing her heritage (during the wendy wu airing) . she did spoke a little bit of hmong..but the only thing that she said was..''
nyob zoo, kuv lub npe hu BRENDA'' and that's it..and then she continue to explain the ''HLAB NYIAS'' that carry the baby..i think it's call someting like a babypounch..or carrying thing..you know what i meant..they also shown some pix of her and her granny..her granny is hmong and so i don't think white have anything to do with this..as in acting all white in wendy wu..i guess chinese girl do that..*sorry didn't meant to you know be bias here*
you can also find it at her site in disney web under the suite life of zack and cody..*how do i know..cuz my little sister watch it all the time..

*...hope this help..