Probably not, but she was taking UW extension classes. She was not a matriculated student at the UW. Now extension classes are pretty cheap today, and were even cheaper in 1960, and non-residents pay the same rates for extension classes as residents.
Just a little more at the University of Washington? What is your definition of "just a little more"? More than double?
Did you not even bother to read the link? The UW tution tables you quote give you tuition figure per academic year. The U of Hawaii figure I quoted you is per semester.
So yes, according to basic math, if the UW per-year amount is just a little more than double the UH per-semester amount, then I'd say the two tuitions are pretty close on an apples to apples basis.