As I was getting ready to ride yesterday, my wife said that she wished we could get bike set up for her. I told her that I already have one set up for her, it's hanging in the closet (Centurion Ironman with straight bars). She asked what it would take to get it ready. I told her a women's saddle, air in the tires, and a helmet for her. We talked a bit about gloves and cycling clothes/shoes as I finished getting dressed.
When I got back an hour later, she told me she'd found a place online where she can get plus-size cycling clothes. I also recommended she check this forum out.
Now's the best time to get her started, because it's not too hot out, so she won't be discouraged by the heat. And it'll be easier for me to want to ride if I have someone to ride with. She's wanting to get in better shape, and exercise more, and would like to do something that we both enjoy. She's willing to give cycling a chance.