Her outstanding conviction is for slander, based on her statement incriminating Patrick Lumumba (which, of course, also incriminated herself). Given the previous decisions of the courts about the way this statement was extracted from her, it is astonishing that the courts have upheld this conviction. Upholding it flies in the face of the evidence. It does, of course, mean that she is not entitled to any compensation from Italy for 4 years of wrongful imprisonment. If the courts had vacated the conviction, she would have been entitled to around £300,000 compensation. Instead, the only compensation she has received is around £16,000 for violations of her rights by the police when she was being interrogated.
Italian law is unusual. If this had happened in the UK (or in most other jurisdictions), she would not have committed a criminal offence even if she had implicated Lumumba to the police voluntarily. Indeed, in the UK statements to the police are protected by qualified privilege, so even a civil case against her would have failed. And of course, in the UK the police would not have been able to coerce her into implicating Lumumba in the way that happened in Italy. She would not have been subjected to over 12 hours of questioning a day over 4 days. She would not have been deprived of sleep and questioned in the early hours of the morning, nor would she have been beaten by the police. She would not have been denied a lawyer. If she did not speak English, she would have been provided with a competent interpreter who understood their role. And the police would not have been able to continue this treatment of her indefinitely until she finally gave them what they wanted - a statement implicating both herself and Lumumba in line with their theory at the time.
Note that, if you were to walk into a police station in Italy and repeat to them your belief that Knox is guilty of involvement in Kercher's murder despite the clear evidence that she is not, you would have committed the same offence as her and, if prosecuted, would be facing a 4 year sentence.