Hello! My Mother In Law Has A Complete Hysterectomy On

hello! My mother in law has a complete hysterectomy on Monday- due to cervical cancer. She had it done using the Devinci (or the robot) however about 2 days later she spiked a 104 fever was very nauseous and had a pounding head ache. She went back to the hospital and the fever goes from 99.9-103 (it goes up and down) her doctor checked her wounds and said they look fine, she had am x-ray and CAT scan done all came back negative. Her glucose was a bit elevated and her white blood cell count was a 13 (a bit high). However she cant shake this fever...we are all getting worried because we have NO answers