Prediabetic and hypothyroidism. Child!

My child 11yrs old is detected with hypothyroidism and on 25mg thyroxine last 15days and  prediabetic and high triglycerides. Have made some dietary changes. Dr. Advice recheck after 6weeks with blood test. Wanted to know whether personal can I do her blood test at gap of 15days, in order to see if any improvement thru this little changes. She had done blood test on 5th and 8th June 2019 and as per those report medication of hypothyroidism started. As per follow up there is time for blood test. Since she is small not able to understand and not ready to do basic walking exercises. She is active but not ready to do regular exercise. Please let me know whether I can get her blood test done after a gap of 15days. Is it harmful for her. Please let me know what test to be done for check of her prediabetic status. Earlier done HBA1C... 5.9% and 122.63mg/dl. TSh 7.103, triglycerides 121 mg/dl. Now in order to check glucose what test to do. please help very much stress and worried abt my child