How does a parent take guardianship from her mother?

You provided very little in the way of details in your question. I?ll try to answer the different possible scenarios: 1. If this was a guardianship that was imposed as a result of a Child Protective Services petition in Abuse/Neglect/Dependency Court, then I don?t think you can regain custody until CPS agrees to reunite your family. 2. If you agreed to sign some sort of guardianship agreement with your mother, and it is not an actual court order, then I believe you can revoke/rescind the guardianship any time. 3. If there is a custody order, or your mother was appointed guardian in a custody proceeding of some kind, then you will have to file a motion to modify the custody order and have it heard in Court.