Warning: In the spoiler below is my theory on the events in the new chapter. SPOILER ALERT!!
We have a very minimal amount of information when it comes to Rin and who she was, what I believe is that she was a spy for an enemy nation. Similar to the first Arc of Shippudden series, where Gaara is captured by Akatsuki. Sasori had seals in select members of Sunagakure ninja so that they were similar to that of Sleeper Agents. Perhaps after Kakashi obtained the Sharingan, Rin's seal was released and the information was relayed to whomever she was working for, since they were fighting Kirigakure ninja, I assume its them.
So I believe that Rin organised with Kiri ninja an ambush that would allow them to capture Kakashi and take his sharingan.
I realise that this is highly improbably, but Tobi was Obito so who knows I could be right.
So I believe that Rin organised with Kiri ninja an ambush that would allow them to capture Kakashi and take his sharingan.
I realise that this is highly improbably, but Tobi was Obito so who knows I could be right.