Ok, they hadn't heard from her since Friday at 6 pm and Alexis's husband texted his wife's friends boyfriend at 11pm on Friday asking if they had seen her but the Friends didn't go over to her apartment until 12:30 on Saturday???
That means they knew she was missing since Friday.
<modsnip>
I did find an alternate source:
Wait a minute! This is the same girl who was on Inside Edition getting plastic surgery to look like Meghan Markle!