Dave Ramsey's books Financial Peace University or Total Money Makeover, buy two one for you and one for her and you can start a mini book club together, you can both read it and help each other get in better financial condition, you don't have to be broke to get in a better financial situation.
I've also heard of having a coupon club where you two can get together and clip coupons, and you can share coupons that you don't use with here and vice versa.
Helping someone financially is one of the most difficult things you can do, especially if they are not open to the help. Sometimes you can just share stories about how you saved some money, or earned some money, that may give them an idea of how they can do the same.