I think that Belle next will be Snow White, Cinderella, Rapunzel and maybe Pocahontas.

or Cinderella or Rapunzel. Definitely NOT Merida or Jasmine! She MIGHT be able to see her as being friends with Tiana because of how Tiana's best friend is someone who is basically the polar opposite of who she is.

Or Cinderella.

Both were princesses who were sheltered and didn't know they were princesses until later in the movie. Also, both love talking about their dreams ("Once Upon a Dream" and "I Had a Dream").

I think Cinderella. I can see her getting along well with most of the princesses, except Merida, Tiana and Mulan.

I don't even know why. I can just see it.

+ Cinderella.

I feel like these two are just the right amount of similar and different to be really good friends.

And Cinderella.

Well, they're both very calm, temperate, have a deep connection with nature and that ethereal air about them. I think they'd understand each other very well. On the other hand, she could also be friends with Snow White, but Snow seems to have more energy - which could work, a lot of friendships work with one friend balancing the other.

I can also see her getting along with Cinderella and Belle, but not being best friends.

I'm surprised she hasn't been picked. They have enough similarities and differences to match well. I'd also pick Snow White, Cinderella, and Pocahontas. Ariel and Jasmine to slightly lesser extents.

In my country they are most likely together.

I'm going to be real here, I usually sort of just pick randomly for these types of polls. Sometimes friendships form between the most unlikely of people.
I just think this would be cute.

I imagine her getting along really well with Jasmine. They were both isolated from the world, albeit in very different circumstances, and they both have a vested interest in their duties as princesses. I think Jasmine's fearlessness would balance out Aurora's timidness, and she could help Aurora meet new people and make new friends, which both of them have always wanted.