My theory is that CN & DM were talking/texting around the time of his arrest (conversations not referenced in this trial as they are evidence in CN's trial) and CN knew first hand that DM had been stopped by police -- and after not hearing from him for ~90 minutes, CN correctly assumed that DM had been arrested (rather than just pulled over for a traffic violation) and sounded the alarm bells. But she wasn't 100% sure of the arrest because she still tried calling his phone about an hour after she "told MS" that DM was arrested. No one was 100% sure he was arrested, but connected the dots after learning that he has been stopped by police and hadn't been heard from since. Therefore the question of "when did X find out DM had been arrested?" is murky... does it mean when did you suspect he was arrested or when did you find out officially? That's why I think no one has a straight answer here.
A quick refresh of timeline to support my theory:
7:35 pm Approx. time Millard's vehicle boxed in by police
8:04 pm Noudga messages Millard: "hellooooo?"
9:09 pm Noudga messages Smich.
9:10 pm Noudga messages Millard: "call me."
9:12 pm Noudga calls Millard. No answer.
9:13 pm Smich (Meneses phone) calls Noudga. Call lasts 245 seconds. Noudga claims he told her, "**** went down."
9:20 pm Smich (Meneses phone) calls Michalski.
9:20 to 10:50 pm Voice calls b/w Smich and Michalski about Millard's arrest, Smich tells Michalski to get drugs out of Maple Gate.
9:22 pm Noudga calls Michalski.
10:07 pm Noudga calls Millard. No answer.
10:23 pm Michalski calls Noudga.
10:28 pm M. Burns calls Noudga.
10:33 pm Noudga calls M. Burns.
Source: https://docs.google.com/spreadsheets/d/1Hb6kEtpLa8cHCVorBuy4yqfHymGvhfHeM6s8QMWGVW8/pubhtml#
Did MM testify that she talked to Noudga? I can't remember her ever saying she talked to CN. That would be pretty relevant would it not? I searched in her testimony but could not find anything.