The deep story here is that Missy is the first Cooper to realize that love is a zero-sum game in their house. Sheldon consumes all the attention like a black hole. Missy's acting out is her Hawking radiation—the only proof that she exists at all.
Here is the hidden beneath the 720p frames. Title: The Gravity of Unseen Particles The Deep Story: young sheldon s05e17 720p web h264
Her mischief isn't malice. It's an experiment. "If I act out," she seems to ask the void, "will anyone actually see me? Or am I just the shadow of my brother's spotlight?" The deep story here is that Missy is