Given your concerns with the grandmother of the minor child, I suggest that you write her a letter referencing the threat that you have written about stating that you expect to receive your child per the court order in place. Keep a copy of the letter for future use and need.If you do not get your child per the order due to the grandmother's conduct, contacting law enforcement with a certified copy of the order for custody of the child seems to be your legal recourse if you cannot afford a family law attorney to assist you.