Your reaction from the guilty perspective is immaterial. We already have the perspective of two unbiased trained professionals to show how normal people did react to the situation present at the cottage that morning. When the postal police arrived, Amanda told them about the open door, the blood in the bathroom, the unflushed toilet and even the broken window and mess in Filomena's room. Did they immediately jump to the conclusion that there was a dead girl behind the locked door? No. they went about their business with the cell phones. Is there even a record that they called their office or any other police branch to report the conditions?
Amanda saw the front door was open but that wasn't unusual. The girls sometimes left the door open when they ran out for a quick errand. She called out but nobody answered. Amanda closed the door but didn't lock it because that might lock her roommate out.
Amanda went to take her shower. Was that you that said that she walked naked from her room to the bath? The heat was off in the cottage. I imagine she would have slipped on her bath robe for that short trek.
It was when she got out of the shower that she noticed some blood in the bathroom. There were only a few spots of blood visible. It's hard to even see them in the Spheron imagery even when you know where they are. Is this enough to wake your roommates who may have been out partying late the night before?
The last thing Amanda sees is the unflushed feces in the toilet. This freaks Amanda out a little and combining that with open door and the blood in the bathroom she decided to grab the mop that she came for and leave. Perhaps one of her thoughts was that there had been an intruder in the house. The instinctive thing to do would be to get away from the house.
They all have cell phones so Amanda doesn't have to act like the typical bimbo in a scare movie and hang around the scene with the killer right behind the door. She starts calling her roommates starting with Meredith because she is closest to Meredith and they speak the same language. Meredith's phone rings but is not answered. Amanda then calls Filomena. From Filomena Amanda learns that Laura is out of town so Meredith is the only roommate unaccounted for.
Amanda tries again to call Meredith but this time both phones go directly to voice mail. This doesn't mean anything in particular because Meredith could have turned the phones off so as not to be disturbed. There are now 3 missed calls from Amanda on Meredith's phones so there is no need to continue calling as Meredith would get the message and return the call if she turns the phones back on.
This is all perfectly natural if you can set aside the fact that Meredith is lying dead on the floor behind her locked door. Guilters apparently cannot set this fact aside when evaluating Amanda's behavior that morning.
Actually, this is some of the points i've tried to stress before with the phones. How does it prove anything towards guilt. Amanda called Meredith and the phone rang but wasn't answered. Amanda calls Meredith and the phone goes to voice mail. Amanda calls other phone that rang earlier and instead of ringing it goes straight to voice mail.
If I found something strange in my apartment and tried calling one of my roommates and this scenario happened to me. I wouldn't call a 4th time. They switched off the phone after my first call. Why would I keep calling them back, if I know its just going to go to voice mail.