What kind of spider has a white body with red lightning bolt stripes?
I, unfortunately can not your question. However, I can vouch for your sanity. I too have seen the same spider. Once. In my entire 24 years of existence. It is a wilderness spider and apparently very unusual (perhaps a genetic mutation or rare phenotype). The spider is fairly small, with a milky white, semi-translucent exoskeleton and (the one I saw) had a prominent, blood-red lightning bolt shape on the back of its abdomen. I saw this when I was picking wild blueberries with my aunt, and I was about 8 years old.