Sometimes snakes bite, I don't think you have anything to worry about. Remember that one, you and your friend are giant predators picking her up, and two, these are still wild animals regardless of how much we handle them. Even a domesticated dog will bite if you put it in the right (or I should say wrong) situation. My BP has only tagged me once and it was my fault, but my hognoses are bullies and mock strike me once or twice every few months. It's just part of keeping reptiles. I even have a crested gecko who, although they can't do any harm, tries his very best to nip my fingers every time I'm in his enclosure for something.