My knowledge is from two years ago, before they improved the gondola. I don't know if they added some more buildings at base. There are a fair number of shops, restos at that base. Some contain areas to hang-out/loiter. There wasn't one single large, fancy base lodge at that location.
I wrote this trip report and it contains a picture of the River Run base:
Unique to Keystone (and that base area) is the opportunity to ride two consecutive gondolas to a point high up on the mountain. Fun scenic ride, and would allow your wife to see/hang-out/dine at the impressive North Peak summit lodge and take in views from there and the Dercum Mtn lodge/summit. Wonder if they would let her snowshoe up there?
Once she's up there she may be tempted to ski again. Keystone has some very low beginner ski trails even from the summits of the aforementioned peaks. I mention some of them in my report.