Gah, I hope JKR decides to be nice to all of us and spare her! On the other hand though, the deaths so far have been relatively unexpected (Cedric and Sirius were who came to mind). With Tonks' career and family relations, you would expect her chances of living to be low as it is. Just a random thought, but I think maybe that JKR would go for irony instead. Like that at the start of OotP, Sirius seemed perfectly safe.

Of course, I could be completely wrong^^