Going to make my special gumbo meal for them and take it down tomorrow.
Very good!
Some people recover quickly from miscarriage, and some are very distressed. Unless you've experienced it yourself, being sorry and offering a meal is about all that's expected.
There are support groups for parents who are having trouble coping with a miscarriage. If your friends have this issue, they can ask at their doctor's office, church, or local health department.