Hello! I'm here today to ask for some help. C:

I've watched all the 10 episodes of Subete ga F ni Naru up until now and the killer was revealed in the 10th episode but... for me the mystery doesn't piece in together.

I'd love it if someone that figured it out could explain it to me in a simple way because i'm either really dumb or i'm missing something.
Here's what i know and why it doesn't make sense.

So, we found out that the body that exited the room on the 15th year wasn't actually Doctor Magata Shiki herself, but her child. So that arose the question inside me "But how did the real doctor get out?" and i thought about it and i though that she could of concealed herself beneath the wedding dress on the cart that came out of the room, but then i though that the space would be too small to fit her in considering she's 20 something years old. They also show that a video recording is missing, the one between 11:59 and 12:01 and then i though that she could of escaped during that time buuuut... then why did the elevator move floors when the body of her daughter came out of the room, and besides, the only other time the door was opened was when they went inside to check it out so it should of been impossible for her to escape.

After that she killed her uncle blah blah.
But apparently after that she got on the boat that headed back into the civilization. So how did she come back with her uncle in that helicopter so fast? And get a haircut on top of that.

If someone could explain that to me i'd be vary grateful.
Also sorry about my grammar. :P

Basically Dr. Magata was already in the elevator before the door opened and showed the body. It was during that one minute that she went inside the elevator. Since everyone was asleep or preoccupied with something else. They won't know she escaped. There was a point in time, that their line to the door was cut so they couldn't opened the door. Dr. Magata made the system to lock on that time, which made trouble to others. This cause for people to gather the hall and checked out her room but it suddenly opened. The lights was timed as the same time as the elevator went up, so no one would notice it.

Dr. Magata already cut her hair inside the room. Since she never really show up to interviews, no one would know the difference between her and her daughter.

This is just my speculation but ecerything would be explained in the last episode.

This is the hexidecimal chart. This should help with the situation. BUt I'm not really smart to understand the significance between the time, date, and the computer programming in the system. Can someone explain it to me.