Well in Alabama you do have significant rights:
Grandparents
But before you take the mother of your grandaughter to court, I would strongly recommend you try some sort of mediation. Does she go to church, what about her parents? Find someone who's opinion she respects who will act as a go-between to find out why she does not want you around her daughter. Save legal action as a last resort.
But, since she owns her house then she can enforce that you do not enter the house.