Contingent on losing her appeal,

This is ambiguous, of course; technically, the "appeal" level is what just happened. The next stage is a second "appeal", at the Supreme Court. (Italian terminology actually uses two different words for the two stages, but they both translate as "appeal" in English.)

Amanda Knox will be found guilty by the Italian Supreme Court.

Again, to be technically correct, what would happen is that the finding of guilt by the appeals court (the thing that just happened) would be confirmed by the Supreme Court.

...because if you're talking about practicalities instead of legal formalisms, what actually happened was that Amanda Knox and Raffaele Sollecito were found guilty by the Italian Supreme Court last March.