I actually listen to this all play out on the scanner as it happened.
The little snippet that has been played back on local media is only a piece of it, and obviously only just the piece what what Ilona first said and then what the dispatcher radioed, not the rest w/ the call room or the rest w/ the dispatcher and what was aired to officers, etc. or any of the part of their search for her and then the ultimate discovery of the vehicle and her and Salvatore.
My hunch, from what I've heard, from living here for decades, and from having been there twice this past week (both before and after the shootings) and driving through the lot yesterday, is that it may NOT have all happened where they were found in the car.
I do believe it happened there in the area around the (actual) mall part of Mission Valley, though.
Everything (or at least all I was able to hear) was VERY calm. She never stated there was anyone else who had been shot, and while she couldn't state exactly where in the mall she was (this, and other part are part of why I don't think it's where they were ultimately found) she was very clear on the fact that that's where she was.
What's most remarkable is that she is the one who died from her injuries, despite having been the one who had called and who was very calm and not at all sounding like she was seriously injured or in pain.
My suspicion is that she had possibly been shot (the one in her abdomen, I'm guessing) made the 911 call and then made her way to Salvatore and the car or he/they were trying to take her for help. And that the rest of the shots - or the fatal shots - may have happened after that.
It was quite some time into it before any information about Gianni having been at the mall also came out. In fact, there are still differing opinions on whether or not he really WAS at the mall - some are saying he actually hadn't been seen since the night prior about 10 miles away in Tierrasanta.
Officers responded immediately, though several things made it seem like this may turn into another 'false call' that there had been a number of lately. There had also been several other violence related incidents that were still being investigated that day involving shootings, guns, or at least shots fired (or mixes of the three)
The SDPD helicopter was before officers and they actually didn't think ANY shops in the mall were still open for quite some time. The lot was quite empty and there were no heat sources popping up on his infrared. It wasn't until he got down to the further (and less high traffic area) by Macy's that they were seeing any heat sources. The thing he had said he couldn't check and needed to be done from the ground was the parking structure that's on the south side of Macy's by the AMC theatre there.
The first officers were finding the same thing - no one and nothing. It was because of heat sources at the end nearer to In & Out (across a small surface street from the back Macy's lot called Camino del Este) that then steered officers to focus their search for someone down there. That's the east side of the mall where the car was ultimately found.
Since this is getting long I'll write more in a second post.