Assuming your daughter's blood sugar was tested before, or at other times during her treatment and not been elevated the chemo would be suspect. Drugs such as decedron/dexamethesone are sometimes given in conjuction with chemo drugs and they can cause high blood sugar levels. Drugs can show different side effects with each individual and this could be your daughter's reaction to them. If the drugs have elevated her blood sugar level the high sugar content in the tube feeding would add to the problem. There are tube feedings for patients with diabetes available should she need them. Hope the doctors can sort it all out for her.