[[WMG: Izzy is really Sherry from Film/MouthToMouth all grown up.]]
It makes sense that without no parents to care of her anymore she would stick to what she knew best.

[[WMG: The eco-terrorist group was actually CREATED by the security company as a false flag operation to drum up more demand for their services.]]
This may be lampshaded by the remarks of the CEO who refuses to prevent jams against companies who aren't clients. The final action is actually a test to see if Sarah/Jane is still loyal to the company. She fails.