When does she tell Marisa she's a spy
Not big on watching this show but was bored last night and checked out a few episodes On Demand. The Pilot and ep. 5 (where her Shake It Up castmate guest stars). In the episode 5 it is clear that Marisa knows so must have found out early on. Sadly those were only episodes provided.
This scenario reminds me of another Disney show "Wizards of Wavery Place" where the daughters bestfriend finds out she's a wizard.