What about seeing if she's willing to have a "date night" every couple of weeks. Take her out to dinner, go dancing etc. Just a night the two of you get out of the house together alone and enjoy a good time. Don't know if you have family nearby, would they be willing to watch the kids overnight?
Mike
M 51 W 49 S26 S25 D24 D19 Married 27 yrs T over 30 S 7/12 D-bomb 9/26