She may be charged, subsequently, with "reticence", but only if she was found to be innocent.
However that would only happen much later. In the immediate situation, what would happen if she refused to answer questions would be that she would be immediately awarded the "indagata" status, arrested, and suspected of involvement in the murder.
So here is a classic heads the police win, tails the subject loses situation.
Mach's statement here is equivalent to saying that indeed Amanda Knox was a suspect from the beginning of the interrogation. If she had responded to questions with silence, which was her right, she would have been arrested for murder. Why, on what evidence? Apparently, her silence.
Had she not named Patrick Lumumba as the murderer as the police interrogators and interpreter/mediator obviously suggested, she would have suffered a continuation of the coercive interrogation until she did name him.
Having buckled and told what the police what they already knew, as stated by the chief of Perugia's police force in the Nov. 6, 2007 press conference, according to Italian courts she was guilty of calunnia, because it turned out that Patrick Lumumba was totally innocent of the murder/rape.
With regard to Italian law, it is worthwhile to recall two CCP articles:
CCP 188
1. Methods or techniques which may influence the freedom of self-determination or alter the capacity to recall and evaluate facts shall not be used, not even with the consent of the person concerned.
CCP 191
1. Evidence gathered in violation of the prohibitions set by law shall not be used.
2. The exclusion of evidence may be declared also ex officio at any stage and instance of the proceedings.
Thus, CCP 188 states that the techniques of the coercive interrogation were illegal. Then, CCP 191 states that illegal evidence may not be used (in a trial).
Yet, Amanda Knox's rights under Italian law were violated in Italian courts because these two articles of the CCP were ignored by the judges. And the ECHR will note this violation as being also a violation of the Convention, because there was no lawyer present at Amanda Knox's interrogation, and thus no check on police behavior during the interrogation. Thus, while the Amanda Knox's application will have some uniqueness, it will be a slam dunk for the ECHR to find Italy in violation of Articles 6.3c with 6.1.