As an ex "Oggie" (16 years served, at the other BZN-based Sqn, not Regt) I'd say to her to go for it and the opportunities it might present. I'm sure it's still true that she will get to do things (or choose to) that you never would in civilian life.
Having a supportive employer is very important, although legislation in place today should mean it should be a lot less stressful than it was when I was mobilised for Op Granby in '91 (I had a very supportive US Corp as my employer, who had a policy on reservist mobilisations - a lot of my colleagues were less fortunuate, putting it mildly).
I would also say that a supportive immediate family (if applicable) is equally important - bearing in mind that a lot of your spare time will be spent elsewhere/not doing family stuff.