For the ones claiming unnecessary stress on the snake/not something the snake requires - these arguments amuse me. Handling snakes in general is considered an unnecessary strain/not something that benefits the snake. Keeping these guys in the first place is pretty selfish of us humans as it is a relationship with a one-way flow of benefit. We accept this fact, though, and keep them anyway, and don't begrudge each other for it.

Since we're keeping them for our own personal amusement anyway, why not enjoy them in which ever way doesn't cause them any harm or risk their health? If she wants to shower with her snake, go for it. Obviously it's up to her to pay attention to proper temperatures and the snakes' over all comfort level, but that's true day in and day out. Nothing's actually changing here - it's just... a different way of doing the same thing. ...very... very different.