Could she be lactose intolerant or allergic to dairy??? In her weakened conditin post surgery it would make the allergies worse!! Her tummy could be VERY upset...not just her tummy either...Food allergies make you irritable, can make you itchy, Can stuff up your nose, Can make your throat sore from all the acid in your stomach... I could go on... You could try a Sorbet or some popsicles... Even try making some with real friut..some bananas or something. You could also try some lactaid or soy milk...Or find something "Dairy free" that tastes better for kids at a whole food or natural food store... A little sugar in her meds won't hurt!...Neither will hiding in her juice or a home made popsicle... Good Luck!!! I hope you both get some rest soon!!!