It looks like a viral diarrhoea
Give her adequate feeds with ORS in small, frequent feeds as much as the baby can take.
Probiotics like sporolac or Econorm
should be given with Zinc supplementation.
If baby is drowsy, not taking feeds or has recurrent bouts of vomiting
, immediate hospitalization is important.
Give liquid, semi-solid foods.
Nasoclear drops can be given for cold.