Pre-diabetes if often used as a synonym for metabolic syndrome or early type 2 -- but without more tests, it would be hard to know exactly what is going on. If you have anti-beta-cell antibodies, then you would be LADA. If you have no anti-beta-cell antibodies but elevated insulin and/or elevated c-peptides, that means that your body is cranking out insulin but your cells are becoming insulin resistant (the hallmark of type 2 diabetes).
A hemoglobin A1C test and some other tests are in order to figure out what is going on. If you are LADA you can prolong the "honeymoon" phase sometimes with insulin injections. If you are T2 you can also do a lot of good by taking metformin sooner rather than later, if you can tolerate it.
"Eating right", "exercise" and "a good weight" are all somewhat subjective.
You're probably already pretty in-the-know as you have a T1 child, but the best diet for a growing child with T1 is not usually the best diet for an adult with T2 -- for example, you might tolerate a lot fewer carbs and find them harder to correct for, even with insulin injections (due to the insulin resistance that is the main feature of T2) than a growing child with T1 (with no insulin resistance.)
If you were to go on a low carb program, make sure you're getting the metabolic equivalent of a one-hour brisk walk, five to six days per week (less time if you jog, for example), keep your BMI under 25 and get good-quality rest (eight per night on a regular schedule is a good target) then you may find that you can keep T2 at bay for years if not decades (that is, you might still develop T2 but perhaps when your seventy, not now.)
Of course, the operative word in that last sentence was may. World-wide, some small number of thin, super-fit triathletes, marathon runners, dancers and bike racers develop T2 every year. Some people just lose the genetic lottery on diabetes.