Hi, alisah! I'm just a parent of a child with diabetes, not a medical professional, but I believe you have valid reasons to be concerned. Your daughter's symptoms do indicate symptoms of diabetes. The thirst and the extra peeing are two major symptoms, and they were the only two we saw when our daughter was diagnosed. If I were you, I would call your doctor and get a urine test done today. I pray we're wrong, but I'd rather know than just continue to worry about it. Good luck.
I think RL has the right idea. I have two children and if I have any concerns or questions I schedule an appointment with my pediatrician. Parents know when something is wrong.