How did she know what she witnessed was traumatic? All she knew was that mommy got a spanking and had boo boos. At 2 her mind couldn't process what she saw. I don't think she witnessed the murder but rather came in the room as JY was cleaning up. I think the violent attack woke her up. She stepped in MY blood and when JY found her he placed her in the bathroom, door closed while he finished then he cleaned her up, gave her meds and put her back in bed. She slept then woke up and mommy wouldn't wake up. Her doll was even found beside MY

He probaly told her to not wake mommy and stay out of the mess. There was blood on MY side of the bed so she crawled on daddy's side. Evidence shows that she was in that bathroom. There is blood on the wall and on the door. That wasn't staged. Again, IF she was taken from the home it would have come out, especially if it pointed away from JY. IMO
We really don't know. The "Mommy got a spanking for biting...." was the daycare play and again it also involved farm animals and two female dolls so I don't think we can draw any conclusions from that.
The prints look very staged to me. They are all equal in darkness and the orientation and the fact that there are several toe only prints. Do you really think one could make that many prints over and over without being dipped back in the blood multiple times? I thought it was interesting that MF made it a point to mention them in the 911 call as well as that is another red flag - people point out things related to the crime.
The prints had no effect on helping MY so it wasn't important for her to inform the 911 operator that her niece had stepped in the blood yet for some reason she felt she needed to mention that.
If CY woke up as you suggest and then went back to her mother's side, how was she found with no blood on her? And where was Mr. G all this time?