Much depends on definitions, too. E.g. an Hispanic person can look almost white or almost completely black, or mostly 'Indian' (Native American) and still identify as Hispanic.
Many 'white' or 'Caucasian' persons have some traits that remind of other ethnicities. The environment makes a difference, too. A person who is considered completely 'white' in Southern Europe or, say, Brazil, may be considered a 'person of color' in Western or Northern Europe.
Many Europeans (for instance, many Hungarians and Russians) have traits that remind one of Asian features without any specific known Asian ancestry.
Take Julia Bond, for instance, she is sometimes casted as Latina and sometimes as white. Julia herself identified as 'white' in an interview. If I would put Julia next to, say, Kathleen Kruz, I think I would consider them quite similar in ethnic appearance, yet one is 'Latina', the other 'white'.
About Ashley Blue, I agree she has some non-prototypically white features (such as high cheekbones). Some Native American ancestry wouldn't surprise me, but then again, look at the European singer Bjork (Icelandic, I believe). You could say the same about her.
In sum, only Ashley herself or her family could clear this up, and there is almost always an element of choice, depending on how much weight is attached to a certain ancestry.
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