ok - so if the door slammed and it was Reeva who made that noise....
they need to ascertain if
a. Reeva was in the habit of slamming doors
or
b. The door always made a slamming noise
if it always made a noise like that then why would OP be terrified by it.
if Reeva was in the habit of slamming doors then why would OP find it unusual
if Reeva wasn't in the habit of slamming doors, at 3 am, then WHY did she slam it that night?