The Character Bus at EPCOT was discontinued a number of years ago. Now the characters (usually Mickey, Minnie, Goofy, Pluto, Chip and Dale) appear at the Character Spot in Innentions while others appear in many of the countries in World Showcase. Daisy usually can't be found at any of those locations though.
Lately, the place I've seen Daisy the most in the past year or so has been Town Square at MK. She usually appears there in the morning and does the Family Fun Day parade in the afternoon. MGM at the Hat is also a good place to check. I think she's only there in the morning there too.