I don’t see it. She found First Lady a bit taxing for her energies. Ghost written memoirs and visits to the View are more her speed.
Michelle Obama did not run in 2016 and 2020. I fail to see what would be different in 2024. Note that it is the conservative media that is speculating on the matter, not the MSM. If she were planning on running, there would be numerous “puff pieces” extolling her virtues.