Filomena and Laura didn't go b/c they were on the way to England, is that correct? How do we know that "none" of Meredith's other friends went?? I mean, obviously someone was at the memorial event. Were these all just random people? And Meredith must have had more than 3 friends.
If Amanda's excuse was that she was on a flight back to the States, I would take that because then she obviously couldn't be physically there. And Filomena/Laura were doing the same thing. I would have no qualms about that.
However, do you buy Amanda's word when she says they didn't go because they had made plans with friends for the evening? That doesn't make sense to me just on a human level. So your roomate/friend, even if it's not a close one, was brutally murdered, the girl you roomed with and shared a bathroom with and who slept in the next room to you, and you don't go because you have plans with "other friends?" That is not a proper excuse, IMO. Considering she was in Perugia, and her excuse for not going is essentially because she was busy with other friends.
I just want to bring this back to reality, so I'll just give a "real-world example." I don't know if you all keep up with the entertainment world, but you know Paul Walker, the actor, died in a car crash. On the site of the crash, fans have come and put flowers, etc.. Anyway, I saw the other day they had a picture of his co-star Tyrese Gibson (I think that's his name), he had come to the site to pay his respects, and he gave a little speech and said how sad he was and how much it hurt him to lose his friend. So I thought that was really sweet, and to me it showed some character and that he genuinely felt sad for losing a friend. Because he could have easily just "tweeted" something out, some standard line, but the real test, to me, was whether or not someone of his actor friends actually took the time out of their day to go to the site. And I know Tyrese did and I know his other co-star Vin Diesel did, and I don't know who else, but that, to me, shows some character on their part. That they weren't just "faking it" when they send out tweets, but actually supported that by personally showing up, which means a lot more than taking 10-seconds to type something up which takes no effort at all. The actual action of what they did spoke a lot louder to me than the words they said.
It's the same situation with Amanda.
She could have shown some character by showing up, when she did not have a reasonable, viable, excuse not to show up. But she didn't.
I'm not saying that makes her guilty. I'm not saying that makes her a liar. I'm not saying any of those things. What it does show me is something about her character.