Constipation is problem of improper diet So first u have to improvise your child's diet.  I hope u are giving her solid diet like Dalia,  oats,  Dal, roti, lots of fruits and vegetables.  Avoid cow's milk or packaged milk as far as possible. Reduce milk intake. Give milk only once in day time rest can be given when she sleep and demands at night. Since there is blood also u should visit a pediatrician but whatever medicine is prescribed remember unless u change dietary routine of your baby her problem would not be solved for long term.

Use glycerin suppositories. Available in chemist shop