Keeping the mouse in the container in the snakes enclosure for even an hour is stressful. The snake doesn't see the container. It "sees" the mouse In it. So it strikes and smacks it's face off of the container. That is stressful. I wouldn't continue to do that. Too Many stressful instances like that and the snake could very well associate that smell with stress. Not to mention desensitizing the snake from mouse smell. I'm sure she would have eaten whether you did that or not. But if you want to prescent. Do it outside the enclosure.