I'll take the bait because I also do not like Daisy.
Daisy is like your best friend's spouse/significant other who usually means well, but whose personality casually undermines your friend just enough to frustrate you but not enough to warrant suggesting to your friend to get out of the relationship. Daisy absolutely loves Donald, but she has Donald wrapped around her finger and she uses that to attempt to keep him in line to her own expectations. We all have friends with relationships like that, right?
Yes, her character is inconsistent from creation to today, but she generally nags, points out the mistakes of others without making mistakes herself, is sometimes displayed as self centered, is subtly snarky etc.
This is extreme Daisy but still what many people see in her.
Here's Donald finding success as an international star and Daisy performing an act to reverse to keep him to herself:
Some would say she's an example of subterfuge, but that's pretty calculating. It's more her personality and most of the time her character is written to be more subtle. Daisy has plenty of moments of being thoughtful, sweet, caring, but she's still has a difficult side that's tough to swallow. In that way she's arguably the most "relatable," but as an adult I don't want to be reminded about my friend with the adoring but annoying spouse.