She is way to young to be diagnosed with ADHD. Some kids are just better sleepers than others and some kids are naturally more active than others.
Does she play hard during the day? Running, jumping etc? It makes a world of difference with my son. On days that he is less active he has a hard time falling asleep and he is also more prone to waking up.
Could she be hungry? Most small children need 3 meals plus 2 snacks a day to keep up with rapid growth. You can try giving her a small snack before bed. She may be waking from hunger, or thirst.
She may also be waking because she needs to be changed or she may just be missing mom or dad. The list goes on and on. You have to figure what it is that is triggering her to wake up i.e. Ear aches, hunger, attention etc. and address the issues.
Does she nap and for how long? She may need shorter naps. How many total hours of sleep is she getting versus her being awake? You can try waking her up a little earlier, put her down for nap a little earlier and see if she goes to bed earlier. It may help, it may not.
I do not think their are many parents who have small children who always sleep through the night. You may have weeks or even months of good sleep, and then periods of not so good sleep. It all comes with the territory.
This mama is tired of people having completely unrealistic expectations of sleep for little children. At 33, I still wake up to pee or get a drink of water from time to time, why then should my almost 4 year old not do the same? Just something to think about.
Good Luck to you.