> Should I start subtly managing her out?

What does that mean? Last time I heard this it was in the context of firing, or rather preparing conditions to simplify the process.

Is it a euphemism for making their work life difficult so they are likely quit on their own (e.g. assign only difficult customers to her)?

Or is it more about establishing conditions that allow firing that are unrelated to the protected class aspect (e.g. assign all non cancellation tickets, than dismiss because they cannot keep up with the load)?

Whatever it is "managing out" just sounds shady.