Lots of speculation that the roommate didn’t actually “see” an unconscious (dead) victim. Door could have been locked by the killer, or perhaps she just tried to get a response by calling and texting and yelling and could hear the phone ringing in the bedroom upstairs but did not get any response. they Roommate may have then decided to call for someone to help “rouse” the individual and that person decided that it was something to call 911 about.
All I do know is that nothing, not the people, not the time of the call, not the circumstances of what we know and don’t know have anything at all to do with the actual murder. They have all been explicitly cleared by LE. Fini. And everyone is fixated on this, when it boils down to a bunch of bird brained children running around trying to make sense of something that is entirely not normal. And everyone is fixated on carrying on and trying to explain something and an event that is entirely inexplicable.