My mother infection in blood, how. itcan bwe reduced naturally?

None: There is no reasonable natural remedy for a blood infection (i'm making the assumption this is a bacterial blood infection). She needs antibiotics, most likely iv, right away.

Septicemia: Or bacteria in blood is a serious life-threatening condition. There is no natural cure. Intravenous high dose antibiotics are usually necessary because this can be life or death. You mother needs a doctor immediately if this is the case.