Use 'ecstatically' to express a very strong feeling of joy, not just slight happiness. She jumped ecstatically, unable to contain her excitement.
Pro Tip 2/3
Positive Contexts
'Ecstatically' is used in situations where there is a positive outcome, like a celebration or achievement. He received the award and smiled ecstatically.
Pro Tip 3/3
High Energy
'Ecstatically' often implies a lot of energy or movement; it's more than simply being pleased. The kids ran around ecstatically on the last day of school.