"Inactive witness" just means she doesn't participate anymore, but has not been formally removed from the church. It doesn't tell us what she believes or plans to do.
If she still believes it's an ok religion to bring kids up in, run very fast and very far away.
My husband, before we married, asked about my current beliefs and stated in no uncertain terms he would terminate our relationship if I ever decided to return to the cult. I assured him I would not, and I have not.
Everyone who is considering making babies with someone else, or entering a committed relationship, should have the same conversation about religious beliefs and plans, really. You need to be sure you're on the same page.