After being discharged from the CIA for her unsanctioned actions in the Season 2 Premiere Episiode, Matty Webber (Meredith Eaton) recruited her for the Phoenix Foundation.
She is ambushed and shot by Murdoc (David Dastmalchian) in her own apartment, but manages to alert MacGyver (Lucas Till) just in time. She returns home to Australia to recover; presumably to visit her sister who she hasn’t seen in years.
In Episode 2×04, Murdoc implies that she changed her name and has a checkered past; and that the rest of the team would be very unhappy if they knew the truth. It’s never revelead if that is actually true or if he was just taunting her.
Reboot series (Season 2)
2×01 DIY or DIE