I could also see her really liking Aurora and Rapunzel.
Eilonwy is feminine and has a quieter strength- I think she would like the dignified defiance of Cinderella. Eilonwy would like Cinderella's strong spirit and how she fights against her stepmother in her own quiet way, as well as how she goes out to the castle for the ball. I think she could relate that to when she freed herself in the prison and ended up exploring the dungeon. Eilonwy would definitely prefer the more feminine, refined princesses.

As I explained in the last poll, I don't think Eilonwy would like Ariel much.

^i agree, how is Ariel almost winning?? she and eilonwy would hate one another.
eilonwy cares about being composed, logical, etc and ariel does what she likes.
also ariel changed herself for a man and eilonwy doesnt want to change herself for taren (Idk how to spell it).