Emily: hacking the school computer with Mona
Aria: Ezra told Aria he wont be able to make it to the Halloween party on the Train
Spencer: finds out Toby is A
Hanna: spys on Paige and Shana
So we saw Melissa with Jenna and Shana saying something along the lines of “those bitches will all be there” and handing Jenna the invitation to Spencers party also wearing a similar coat to the one we caught a glimpse of belonging to whoever burnt down the cabin. Now I know Melissa and Spencer haven’t had the best relationship but I don’t think Melissa would try to kill her own sister. This together with the fact we saw A send Jenna a text message, tells me that Jenna, Shana and Melissa are also scared of A and were trying to burn the A team not the PLLs.