What exactly are you giving her?
Am asking this because many mummies here give apples and bananas plus rice regularly without knowing that it causes constipation. Some veg like sweet potato and pumpkin (or any starchy foods) can cause that as well.
Also, how much liquid is she taking?
One way to avoid constipation is to increase fluid intake (for water/juice/anything that is not milk, up to 4 oz) and to offer fruits that help prevent constipation like pear, plum/prune, papaya and peach (those that start with P). This will ensure that they are regular (if they go on without pooping for over three days, it's a sign that they could be constipated). I usually up Eva's fruit intake if she doesn't poo once daily but so far, she has been regular. Pooping at least once to thrice a day!