Not necessarily. The first 7 people ejected from the game are not allowed to go home until filming is complete. Even if you are the first person ejected on Day 3, you must spend the next 36 days with the production. They are usually sent snorkeling, on safari, etc. My point is, if Tanya was one of the first 7, she would still be there, and would not already be home.
However, given that Tanya works with injured children, and her generally cheery appearance, I'm beginning to suspect that she will become the sweetheart of this series, ala Colleen, Elisabeth, and Neleh. I'm betting that she'll make it towards the end.