U need to start giving your child some liquid diet as well. Give her moongdal water ,rice water and along with that give puree and other home made semi solid food along with boiled apple, boiled and mashed potato ,banana and then see. If the child refuses to drink top water it's okay even if he has 4 5 spoons at a time that's fine
Stop giving cerelac and other flavoured food items .
Next Steps
just try and give homemade liquid and semi solid food
offer water and don't force it to the child give as much as they want.
also continue breastfeeding because even breastmilk has water content.
if constipation doesn't resolve than consult a pediatrician in person.