What does it mean exactly if someone is granted "Temporary Guardianship" of a minor in the state of Oklahoma?

My daughter was taken from me by my mother (her grandmother) for a visit, when I asked when we could meet so I could pick her up my mother informed me that she had filed for temporary guardianship, the court date was today and the judge granted it to her. What exactly does this mean and what's my best options as far as legality goes?