Daisy is playable in the minigame Daisy's Rodeo, where you need to press the right buttons to stay on the mechanical Bowser's back, if you press the wrong buttons too many times Daisy will fly away. While this game was released after Mario Party 4 Daisy's design is her original design and not her current appearance.
Winning the minigame will give you the Daisy card which features her Mario Party 5 artwork.
☀ Mario Party-e is the only Mario game where Daisy is a playable character and Peach isn't.
See the Mario Party: Gallery.