Sorry; it's like ASIST, PAB is just what the thing is called. If her background was that of an agent, then yeah, she might return to HQ (or base, or whatever) after each mission, only to have the mission details erased. And certainly it could result in having had brain damage, or at least short-circuiting. If that were the case, I would (as GM) allow/require her, any time she tries to raise those stats, to put karma towards buying off the Amnesia quality - presuming she has one. At the point she's back up to agent levels, she's regained much of her memory, or at least enough to make things very seriously dangerous, for her and the people around her, a la Jason Bourne.