She really was a cute girl.

https://i.postimg.cc/jSx9ZpWZ/429642057-248663348302581-2659866861151801561-n.jpg

Could it be The Historical Andersons? (S2 Ep 24)

I thought it was Bud as the dreamer/time traveler? I did not watch that one past the first go round.

This is an extreme longshot, but maybe they had Elinor try on some different costumes for "Betty, the Pioneer Woman" - 1958, Season 5 ep 9? She looks a little too young for that one though.