Spy Anne Hacks Computer and Tried to Steal Secrets

It was clear that Anne/Elizabeth was after the information that David had access to as director of a national security company. She had been using Jessy and David for years in order to get close to him and gather intelligence. The fact that she was able to fool them for so long is a testament to her skills as a spy.

The night footage being wiped was obviously to cover her tracks and prevent them from discovering her true identity. She also tried to crack his computer password in order to get access to the information she was after.