Oh, that "understands" depends from how Myriam managed the situation till now.
She had "n" times the possibility to say "no" and thus take control, although if I understood correctly (I did not check the code etc.), saying "no", at least in some cases, would have meant killing down completely the Cassius possibility.
But if she didn't, then, whether she is the alpha, or Cassius thinks he is the alpha (and what happens when William is there ? And what happens when Marc goes there for the pool party ? Will Cassius do like he did after Anthony's dinner, for those who had it ?), is more open to discussion and to Myriam's actions

.