It is not bizarre at all to me. Anyway, she did not do what the truly innocent people did, either. She did not leave town like her roomates did. So if people are saying she is innocent because she stayed, then that does not match what the innocent people did, either.
I have repeated over and over again why Rudy and Amanda are not equal in this situation....Rudy could leave and no one around Meredith or the police would have noticed, because he was not "on the radar" from Day 1, until police got the evidence of him. I'm going to repeat what I said in an earlier post: no one thought on Day 1 after the murder was discovered, 'oh where is that guy by the name of Rudy Guede'? He could leave and no one would notice. Amanda, on the other hand, was Meredith's roommate, and her absence would have been noticed by people around Meredith, first of all and most notably, the other roommates. Also by police, who would naturally be questioning the people living with Meredith, and those who had contact with her in the last days of her life.
Yes, she should have gone when the roommates did. That would make sense and not be suspicious. But Amanda, knowing she was guilty, thought it would make her seem suspicious. Because she knew what she had done. And having that knowledge, and then getting on a plane and going away, in her mind that would make her seem suspicious to others. Like a hit-and-run, to put it into more understandable terms. Fleeing the scene. Trying to get away. Trying to run away. I believe that she thought her leaving would first, draw unwanted attnention to her and she did not want attention or closer examination of her, and second, would raise suspicions if investigators had any questions about her.
On the other hand, staying and being "available" to the police, she thought that would make her seem like she had nothing to hide. Like, she was just ordinary Amanda, nothing out-of-the-ordinary there. Just as some are saying to this day, that look, obviously she had nothing to do with it, look she still stayed there. She still answered police questions. She still cooperated with police. It is working on people, even to this day.