That's what it looks like to me also. Very similar to the way we look when we bite our lip.But snakes teeth are sharp & curve just enough to be trouble. Do your best to keep her calm- not too heavy handed & let her rest. Most snakes seem to figure out we're trying to help them when we're patient, even though they hate whatever we're doing. Might help if someone else can help you restrain her, but I've done this solo before, so it's up to you & what you're comfortable with.