Give yakult, yoyic or vitagen, if u feel too sweet, dilute with water and let her drink.
U can try make milkshake for her like avocado milkshake which help in constipation too (just to get her interest in anything that help with constipate.
Drink more water like barley or chrysanthemums tea, as it's help a bit too, so make sure she is not too heaty to produce hard poo too.