Young Lady Eddison?

Would anyone happen to have a source on who portrayed the young Lady Eddison in The Unicorn and the Wasp? I've checked IMDb, Wikipedia, fandom, Shannon Sullivan, and a few sites I wasn't previously familiar with. Fandom had the names of some of the uncredited cast (footmen, kitchen staff, etc.) but I couldn't find anything about young Lady Eddison. Thanks!