Some snakes seem to enjoy getting to roam around in the grass, others don't. If she seems to be okay with it, then having her out for even 15 minutes would be okay. I know my BP HATED outside; the only time I EVER saw her ball up was when we took her outside. But my BCI seems to enjoy checking out the different things outside. As long as there's no fertilizers or chemicals on the grass, it's warm enough and your snake is calm and exploratory, there should be no problems. She's very cute, especially in that second picture! It's like "Here I am!!"