I have lost a newborn baby and it was a horrible experience. No one who has not experience it can truly understand how painful it is to lose a loved and wanted child.
As the spiritual head, you could direct the family study night to subjects that are, well, kinda eye opening.
I would study www.jwfacts.com and use that as a guide. Do the blood issue and the many, many Pharisaical doctrine that there is no scriptural backing for. There are tons things, such as birthdays, the qualifications for elders/MS, etc that you can use. (ie., where does it say that a person has to have 10 hours a month of FS to qualify for a MS, etc.)
Maybe you could gently lead her down a path that will lead her out of her own spiritual darkness.