She is suffering from ADD – Severe dehydration. So she should be treated according to Plan C

100ml/kg RL or NS= 1300 mliv

Children - 30 ml/kg in 30 minutes (390ml)

70 ml/kg in 2½ hours (910 ml)

Zinc – 20 mg daily for 10-14 days

Lowers the duration and severity and incidence of diarrhea in the next 2-3 months