+1 to the running. I know you said she's tried jogging in the past, but has she ever done a race? My wife and I started running 3.5 years ago with the couch to 5k program, and the rest is history. Running is a great release for us, especially when the stress starts piling up (and it sounds like you all have pretty busy schedules). And there's just something about finishing a race that gives you a great feeling of accomplishment.
My wife recently completed her first triahtlon, and is currently training for her first full marathon. Me, I'm still just a half-marathoner