Because ABC is a Disney thing and they pulled pretty much all of their stuff from Disney versions of those stories since those versions are their IP, I don’t think so. Swan Princess wasn’t done by Disney. It’s probably why they never got into Thumbelina either.

Also, Swan Princess is based off of Swan Lake and Emma’s story bears no resemblance to that one. Her character arc is more like the Ugly Duckling (Disney did a version in the 30s). She goes from feeling out of place to finding home and her people.

I’m sure you know, any character that makes any bird associations typically has feather and wing motifs (if they’re meant to be a good and/or graceful character) in costuming, props, background deco, and/or symbolism and we do see that with Emma. It does make sense that some people might find costuming similarities between Emma and Odette at certain points, but Emma isn’t based off of Swan Princess.