Not in real life, and she didn't command it to record when she told Maia about the fake bribe, but maybe it does in The Good Fight universe.

As soon as the Echo device first appeared in the series, I knew this was where they were going with this. Thing is, they only record your commands, not everything you say.

I was thinking about how they haven't brought up Diane's financial situation in a serious way since like two episodes ago.