Something's Wrong with Shiro

Pidge notices after Shiro snaps at Lance that something's up. How much does she know and what will she do to find out more? I always found it suspicious that Pidge just so happened to have a program ready to shut off Shiro's arm, and that she recognized it was Shiro so quickly. Furthermore, this new Shiro had the tech skills to combat her... I sense more happening in the shadows.