At the end of this season she will be gone. Replacement has not been cast yet.

https://tvline.com/news/law-and-order-cast-camryn-manheim-leaving-1235237650/

Camryn Manheim was fired from ‘Law & Order’ because she makes too much money (https://www.intouchweekly.com/posts/camryn-manheim-exits-law-order-for-cheaper-actors/?utm_campaign=trueanthem&utm_medium=social&utm_source=instagram)

They had to let her go and replace her with cheaper actors.