You can see Toto a little better in this one. ^^
Is Dorothy a modern incarnation of Alice?
Ask the author and find out.
I did eventually and apparently Dorothy is an updated Americanised version of Alice.
How could you when the author of the book died in 1919 and the script writer for the movie died in 1980?
that's a good question, however the death of the original writer and the script writer have nothing to do with the answer to the question which will be revealed all in good time, just be a little patient.