My reply is similar to the post above: the number one reason married couples get divorced is over financial situations.
Student loan debts are almost possible to get rid of, even in bankruptcy.
I am also curious as to how long she's been able to stick to the budget?
Do you two sit down and plan out your financial goals and priorities? If you love a person, then her problems are your problems.
The biggest downfall would be is if sometime down the road something happens to you, s*** happens yanno.
She and your child will be basically destitute, at least at first and possibly for a long time.