I think the only advice that I could give her is start to find a job so when she is in the age of 60 to 70, she is rich and filthy! hehe
I have also noticed that many rich guys here are married to older, plain women (or even ugly ones). I think part of the reason for that is it must be hard to stay thin when you do not have to work and can eat out every meal.
Having kids may have something to do with that too I wouldn't want my future wife to put her looks in front of our baby's health/safety.