I was gonna say that fictional characters don’t really have actual birthdays. But then I realized I guess technically they do have birthdays. But THEIR birthday would technically be when they were first created and first appeared in fictional media. But I don’t know when Daisy was first introduced to the Mario series. So, I don’t know if this is accurate.
Yes, I am very aware of how random this analysis was. But just thought I’d point it out anyways.