Strangely enough, I found this article on my own just about a week or two ago and became fascinated with her story. Yes, she did get the role of Marta. Her mom's website is lisagee.net and there is a blog where she talks about some of Dora's experie…
I have the book! I bought it in England, very interesting reading.
Where does it say that she ended up renewing her contract in the show and went on to perform the role of Marta, the second to youngest child? It didn't say so in the book...