[that choked sound... was Wallflower... crying? Sunset's grip tightened a little, and she shook her head. she was glad that Wallflower Blush noticed the difference in her, but sad that she didn't have any confidence in herself]

You're my friend. [she says simply] Maybe you don't have Equestrian magic with you, but you have magic of your own, that only you can produce. Whether it's by gardening, or helping me as we look for clues on how to get home. You're special, Wallflower. Don't forget that.