Who is Donatella Rahn from Separation of Power and what is their importance?

Donatella, once a model, now works as an assassin. Peter Freidman hires Donatella to kill Peter Cameron. Mitch, her old boyfriend, is then contacted by the government to get in touch with Donatella and find out who hired her. In the end, Donatella tells Mitch what he wants to know and finds herself on Mossad's hit list. As a result, Mitch brings her back to the states for her own protection.