After the election Trump met with Sidney Powell in the WH at least once and she held press conferences with Rudy Giulianni while he was working for Trump. The rally that Powell and Lin Wood held in GA wasn’t an official Trump sanctioned event and I don’t remember Trump’s response to it. I don’t recall any objection, but I am open to correction. While Powell promised the Kraken, she may have not been officially on the Trump team, but she was allowed to get close enough to give the impression she was. When she went completely rogue they made sure to distance themselves from her. Whether you call it working with Trump or not could be debated.
She went to the WH but was stopped from actually meeting with Trump. I’m not sure they ever met.