I'm not basing that observation on records but on who she communicated and associated with publicly on her numerous social media accounts. I started digging the night he went missing. So noticed the pattern. I thought she was native until the white label based on her appearance.
I have seen no Hispanics mentioned, but there are a couple of public records from the past where TS is listed as Native American. But she's mostly listed as white, probably because she's both. She may alternate use of terms in order to further confuse her public records.
Her relatives with public records are often recorded as "White" as well.
I'm not sure why it matters, except that of course, criminal defendants can try to obscure their identities by using more than one label. I'm mixed race myself, but learned long ago it's better to go with a label that helps explain how I look, especially if going for military clearance or a LE job.