It's not what we believe that influences anything, I'm going by the fact that her classmates have all lost their yearbooks, those that were in the high school library 'were stolen' and her image supposedly from 'the yearbook' was cropped in such a way that none of the other students could be identified. It simply looks suspiciously like she wasn't there after December 1959, when according to Maya, the Dunhams moved to Hawaii.

I think it's best to leave that door open.
‘those [yearbooks] that were in the high school library ‘were stolen’’
This is the myth that won’t die. No yearbooks were stolen from the library. Not one.
I’d like to see some backup on the claim that ‘all’ her classmates have lost their copies. How was this ascertained?