Honestly, I'm amazed that Martha has survived as long as she has.
In a way, her current situation is similar to Nina's back in the day. Her handler is concerned for her personal well-being and worried about her being exposed as a traitor, but his superior is more concerned with getting maximum value out of a valuable asset.
That conversation Philip had with Gabriel about Martha? Pretty much the same conversation Stan used to regularly have with Richard Thomas concerning Nina's increasingly precarious position.
"Well, of course, we'll do our best to protect her, if and when it comes to that, but in the meantime we still need the intelligence she's providing us . .."
And we all know how well that worked out for Nina.