Nature is a cruel thing. My husband thinks that found Mama Bunny in a patch of weeds in the back yard, she didn't seem to have any injury, but she was stiff and there were flies hovering around her. I didn't get a chance to go out that evening before the sun set. When I went out the next morning, there was no sign that she had ever been there. Some creature of the night probably dragged her into the woods nearby.
We haven't seen her in several days, so I am guessing that it really was her not some other rabbit out there.