Abilify can be activating for some children. It's in the medical literature. So if you see your difficult child getting more hyper and giddy on more Abilify, definitely call the psychiatrist ASAP.
And gcvmom is right, Zoloft can cause hypomania/mania as well. My son had a horrible reaction to just 25 mg Zoloft. We needed to take him off Zoloft to get these symptoms under control.