DUSTY IS BEST CAPTAIN

Suri Polomare: [chuckles] I'm so glad you made it, Rarity!

Rarity: Me too, but everything just seems to keep working out!

Suri Polomare: Don't you remember me? Suri Polomare from the Ponyville Knitters League?

Rarity: Oh, yes, of course, of course! I– I thought you looked familiar, but I couldn't place it. You haven't been back in years!

Suri Polomare: Because I moved here to make it in the big city. [laughs], okay?

Rarity: Oh, good for you, Sur—

Suri Polomare: Ooh, it's so good to see you! And now here we are, competing! [laughs], okay?

Rarity: Yes, yes. Well, good luck!

I really don´t think Suri is a lost cause, just a very difficult one.She seemed to have been a decent pony before she moved to Manehattan.I think she was genuinely happy to see Rarity again. But when she saw her collection she became greedy and also saw her as a serious threat so she made the wrong decision and copied it.Suri has certainly much talent; she was able to recreate Raritys collection after seeing it only once.She is practically a less fortunate version of Rarity.A redemption can work if these two find themselves in a situation where they are forced to cooperate (a friendship mission would be ideal).They would argue and snark at each other at first but finally Rarity might be able to get through to Suri, learns about her past and helps her to better herself.The fact that they are old acquaintances would also help.