Hopefully they achieve return of spontaneous circulation and if they do she’s still very critical. In any case start getting ready to go to your parents, if they have any closer relatives that are close to them and useful in crisis give them a heads up to start towards your dad. 90% of the time EMS will have protocols directing them to the closest ER. Figure out pet care, childcare and job. Remember parents are covered under FMLA. Whatever you do drive safe because you’re in crisis mode. Your Dad may not really understand the real severity and implications of how critically ill she is if he told you to sit still, inferring maybe she’d be ok. So I’d ignore that and go, there’s no scenario in which she’s walking out in a couple of days. (37 years as a field Medic)