Why not suggest that she take some college courses if she hasn't finished her degree, or maybe a part-time job? This would give her an opportunity to do something productive outside of her 'Mommy' role, as well as to meet new people.
It's important to have some time away from the home when you're a SAHM. Just small-talk with other adults is a serious thrill, when your on your own with the kids all day.
If she has a little bit of time to pursue her own goals, chase her personal dreams perhaps.....she won't mind that you take some time for your
self too.