We don't know Adrienne or what she would do. I am not even confident I would have called 911 in a similar situation. When considering cases like these, it is important to remember that rational conduct can't be applied to people in irrational situations.
Consider this scenario, for example:
Ada and her new dog go for a walk earlier in the evening. She texts her boyfriend to excitedly report that she thought she saw a cougar. She returns to the cabin, goes about her evening and retires for the night, maybe she locks the door now. Sometime in the dead of night, she awakens to strange noises. Perhaps the dog barks. She gets up in her stocking feet, grabs her gun and phone and looks out into the dark. Something spooks her. She calls her boyfriend. He doesn't pick up. She calls her sister. She doesn't pick up. She calls her friend, who answers. Now begin thinking how time elapses from here. She says to her friend, oh my god I think theres someone here. The friend might ask, are you sure, what do you hear, can you see them? Adrienne makes her way slowly downstairs, flipping on the lights for comfort/safety/because she thinks they've gotten inside already. More than a minute has elapsed now. She enters the living room area attached to the porch and through the front windows sees a car's headlights. They're coming up to the house, she says. Perhaps she calls out and fires a warning shot into the ceiling. She's panicking now, adrenaline rushing, instincts taking over. The men are telling her to come out or they'll have to come in and get her - you see, bad guys don't like leaving traces, especially these kind. Things are happening faster now, we're almost 4 minutes on the line. Ada has put the phone down to shoot through the window as the guy comes up her porch steps. She thinks she gets one in the face, and perhaps she does as he sits in a car or on a motorcycle, any evidence carried away with him and the vehicle, or perhaps there are no men at all, and she is experiencing phantom hallucinations brought on my her concussion, stress, lack of sleep or disturbed REM. Her friend tells her hang up and call 911, but Ada is crying, panicked, insisting her life is in danger. The friend tells Ada to get somewhere safe and then hangs up to call 911. Ada flees to the back, away from the perceived threat, and decides the roof is her best vantage point - if they get inside, they won't find her and she has visibility and a better shooting angle from there. She grabs her boots, scrambles out the back window onto the awning and throws her boots and phone ahead of her onto the roof. She is about to climb up after and then...? She drops the gun and vanishes.
So as you can see, in this hypothetical, the need and opportunity to call 911 doesn't come until the friend does it, if the men are criminals, Ada is not going to do it on her own. She is barefoot from being in bed, only had seconds to escape or react. The dog is likely hiding and scared shitless from the gunfire. If she really had OMGs or similar coming for her, this is a plausible situation, and if she was medically hallucinating or on a drug like meth or oxycodone, also plausible. LE has more evidence than they are telling the family or media, I guarantee it. They know exact paths or results of dog searches, infrared and man trackers. They know if there were foreign tire tracks. They know L's history and if he is involved in bad juju, same with Ada's fam and Ada herself. They know if the event in July could be related.