Not that I trust the US media, so I could be off base, but everything I've learned is the prosecutor was on a witch hunt and the "evidence" was practically nonexistent. The prosecutor jumped to a judgement and then had to save face. I read about this case AFTER she was ACQUITTED by another Italian court.
there was a long in depth article about the trial, it was as you said. Whaacko prosecutor.
As for 'nonexistent' evidence, there were the six 37 bloody footprints found on the carpet with luminol, the same size as Amanda's shoes. There were the five drops of blood in the bathroom mixing Amanda's and Meredith Kercher's DNA. Of the two knives used to kill Amanda Kercher, one matched in size and length one of Amanda's kitchen knives, which had Amanda's DNA on the handle and Kercher's DNA on the blade.
There was Amanda's purchase of cleaning products after the murder, the mopping of Kercher's bathroom floor, and Amanda's borrowing of her boyfriend's mop.
There was Amanda taking a shower in the bathroom after the murder and claiming not to see the bloody footprint on the bath mat.
There was more.
On the other hand, Amanda was subjected to police misconduct and prosecutorial misconduct. She was subject to Anti-American prejudice.
The media tried her case in public, using Amanda's inadmissible journal and inadmissible witness statements.
We've discussed evidence, innocent arguments for evidence, Italian misconduct, and the confession of Rudy Guede (which places Amanda and her boyfriend at the scene with him) at some length in this earlier thread.