Each realtor had her own client. They were working independently. The system allows all agents to show any property, so this lady was simply showing Beverly's listing to her own client(s).
The other realtor had locked herself out during her showing, and since it was Beverly's listing, she texted her to see if maybe she had a key handy because it was Beverly's listing.
I doubt very much how the realtor got back in, or who her client was, or if AL was supposed to see that same home has much to do with anything.