What exactly does "10% Spanish" mean, and how exactly did you reach that figure? As far as I know there is no such measurement, although people often speak of being one half or one quarter of some nationality. Other than that, the concept is meaningless.
Well then you are just going to have to bug ancestry.com to explain what they are talking about when they say that. I am pretty sure they will have a polite explanation that does not explain anything.
She found out through that Ancestry DNA test from ancestry.com.