I think it is best if you keep the routine very simple. I would suggest conditioner washes or a gentle shampoo as needed, a good moisturizing conditioner, and a good leave in. Young children's hair tends to be much healthier than that of older kids and adults so if you take good care of it, I doubt you will need to do deep treatments, etc. on her hair until she is much older.
Use a wide toothed comb to detangle her hair (make sure it has no seams). Try to do this only when it is wet and full of conditioner to avoid breakage.
On a daily basis you could moisturize it and put it into as many or as few ponytails or pigtails as desired. This would keep the hair out of the way at this active age, and also help conserve moisture. If you keep it hydrated, you can also leave it out from time to time. Even if you do the latter, it is best to keep it braided at night to avoid tangles.
Are you looking for drugstore products or would you be interested in salon or specialist products for curly hair?
You would have a lot of luck posting this in the 3c and 4a forums also.
There is also a useful thread in this forum about the routines parents are using for their curly toddlers: