If it was campus police, they would respond immediately. Do we know if it was campus police who showed up first to look for Laken? I don't remember what MSM reported about who arrived first on the scene to search for her.
Some states have campus calls to 911 go directly to the campus LE. I don't know how it works at this campus of the University of Colorado.
Athens resident at UGA alum here - in my experience, when you call 911, you are routed to the Athens-Clarke County Police. UGA PD has jurisdiction over all UGA property as well as, in some special circumstances (which I think this would be) up to 500 yards from the property. Since the roommate seems to have called 911, she would've been routed to ACC PD. I lived on campus at UGA for a year, a year in the sorority house, and then two years in a home less than a quarter of a mile mile from where this happened. Even when living on campus I would never have thought about calling UGA PD. Honestly, as a student (or Athens resident) you forget they exist. They drive around campus, respond to issues in student housing on campus, and help with football security. Nothing but respect for UGA PD, but I don't think anyone would really think about them in a real emergency. I looked on their website, and they say to only call them for a non-emergency. Now, I do think think that 911 / ACCPD can dispatch them, and it would make sense to me that UGA PD would be closer to the IM fields and able to respond more quickly.
This article says that the roommate called UGA PD. Other articles just say she called "police" or "authorities". Not saying that first article is incorrect, but I find it very specific that she called UGA PD, especially considering they lived in off campus housing. Perhaps her thinking was that Laken should be on the UGA campus, so they needed UGA police. I would just have to do some digging to find that number rather than call 911.
All MOO, just thinking out loud here. Personally, I don't think which "police" she called is a big deal. However, when I put myself in the roommate's shoes, I do think she had to have access to the location of Laken's phone. My roommate at UGA was a marathon runner and would tell me "hey, I should be back by X" when going on runs. She'd also give me a general idea of her route. Had she not returned, I would think maybe something awful, maybe car trouble or a wreck, maybe she ran into someone and went to lunch. This was early iPhone days, so I don't think I could've tried to see her location. All that to say, I'd probably go drive her route or look for her car where she was starting the run before calling 911
unless I knew something more - location, no movement in a while, etc.
JMO