You seem to be arguing against someone who would ask "how could this have happened?" You're the only person who brought up that question, two posts up.
Actually I read the line "I forget that Disney's goal is to make money without concern for integrity. Silly me."
as implying exactly that.
Personally, I think she knew it could happen but hoped it wouldn't. But she made her deal with the devil - make the movie and lose the rights, or not make the movie at all.
Also, let's not forget that she will still make money from the changes to the character -- if Disney's research proves to be right, she'll actually be making more money from those changes than she would have pre-change.
The creator's actually in a pretty good position, she can complain about the change while potentially making more profits from them.