@thephysicsgirl is Dianna Cowern's X account: joined March 2012, 206,833 followers, 11,999 posts. The bio reads "Science Video Creator, Tweeting about #LongCOVID as @diannahaze, MIT Physics, Forbes 30u30" and links a Patreon.
We list it because Physics Girl is one of the names that comes up whenever someone looks for accessible physics video, and because the bio itself tells you the account's focus has moved: it explicitly redirects readers to a second handle for long COVID posts. That is the account owner's own framing, not our inference.
We could not read the timeline, so we cannot say when she last posted about resonance or waves. Treat this as a who's-who entry: a large, real, long-established science account, currently pointed somewhere other than the physics.