The lying down in the grass and rolling on her back sounds like she is pretty relaxed already I would take her out (or let her out if you have a fenced yard) after she eats and on whatever schedule you want her to be on. They are very flexible dogs in adjusting to your routine, but they do like a routine. If you don’t want her on the bed or furniture now is the time to start that. If you don’t care, well, I let mine sleep wherever they want. Usually in my room on one of their beds (yes, I have multiple dog beds )
It sounds like she is doing fine, try to relax!