Lots of reasons. First, she has access to Saul. As long as Saul has power, she’ll be valuable because she has access to him. She’s not in the CIA right now and she would still be a prime recruitment target.
Second, we saw in season three how alluring she would be to foreign governments as a “wronged” agent.
Lastly, she knows where bodies are buried. She’s a former station chief! She was an advisor to a president! She knows how the US government thinks. All extremely useful.