From the way she described what happened it sounds like a mistaken identity strike the snake felt something warm and went for it.
That is my thought because she let go immediately.
It just seems some people have a hard time the only snake bites that got my attention where my Burmese I had one that got me that required 3 stitches still didn't give up on her.
But I did finally get tired of the having to have 2 people to deal with them so I found them better homes.