I would imagine....Aurora's at least got the fairies and the animals...Belle's got her father and the fair...Jasmine's got to have tons of stuff to do..Cinderella's at least got her animal friends and stuff to do..

Jasmine has never even been outside the palace wall and her only friend is a tiger who can't talk like other Disney animals. She's so lonely she runs away.

Also, Aurora was raised in the woods and the only human she's ever met other than her three fairy aunts is the prince of her dreams.

Ariel...lonely? That's one of my fave films and she has a best friend and 6 sisters...

Aurora, Cinderella, Snow White and Mulan, but at least Mulan wasn't so lonly she made friends with animals,

Aurora or Snow White. I see princesslullaby's point, but I think that Snow White is a bit too optimistic to be lonely. She's got animal friends too :)
Aurora sings a song about wanting to find someone; throughout that whole scene she just seems very lonely.

I agree with kateliness2

I personally think Cinderella's the loneliest.

Cinderella, Mulan, and Aurora had animals. Snow White was too optimistic to be lonely. Ariel had a best friend and six sisters.
Jasmine was so lonely she ran away...

Jasmine is sheltered up in that palace and she only knows a few people: the Sultan, Jafar, Rajah, and those awful suitors.
Cinderella has Bruno, the horse and ALL the mice.
Aurora has the animals and her three "aunts".
Snow White has the whole forest AND the seven dwarves.
Jasmine wins on the loneliness scale. Only two of the people she knows are people she likes, and one of them is her dad so he doesn't really count because they argue a lot.

Would suck to be in a abusive situation like Cinderella’s. Even if she does have her mouse friends. The abuse she had to endure probably did make her feel extremely lonely and isolated in her struggle.