Which of the Mane Six would you want the most as your daughter/what do you think having them as your daughter would be like? Teen, adult, doesn't matter.
She isn't my favorite horse of the six, but I think I'd go with Fluttershy. I love animals, so I'd definitely support her hobby, and she'd be the nicest, least demanding daughteru of them all. That and she's canonically a weeb, so we'd have another thing in common.