I am having a similar problem with my full of energy 3 year old. What I bought her already was a Little Mermaid floating vanity for the bath since she loves to take a bath. i also bought her a few my little ponies.
i bought her a sit and spin for her birthday, which was in october and she loves it….she plays with this more than any other toy. also for her birthday i bought her a little mermaid pop up tent. she plays in this all day!
i put her little kitchen in there, which she had stopped playing with months ago, but now she plays with it again.