Unless the model have very distinctive feature or there is some easy clues to help us like the clothing in question being part of a character's bundle, i feel it's just about a wild guess trying to figure out models like these when the author doesn't write down it source.
But if it can help you Happy, here are my guess...
When you go check for what models " Eloise Outfit " is best made for, you get all this list of characters:
- Aiko8
- Alexandra8
- Charlotte8
- Edie8
- Gia8
- TheGirl8
- Karyssa 8
- Kaylee 8
- Latonya8
- Mabel8
- MeiLin8
- Mika 8
- Monique8
- Olympia8
- Teen Josie8
- Sakura8
- Stephanie8
- Penny8
- Victoria8
Although it's not always the case, a lot of the time, artists just stick to using one of the model for which the piece of clothing is best suited for.
Some of the models cited here can be easily discarted.
Of those that to me look closer to the models with the curly hair you are looking for, i think it's either:
Charlotte 8, Stephanie 8 or Victoria 8.
My best guess though would be between Stephanie or Victoria.
I cannot be sure though. Maybe other people here can give their opinion and thought on that.