Do not cross the mighty Fiorella.
Do not screw around with her doctor appointments so she is running weeks late for treatment. Do not try to blame it on Fiorella's insurer. Do not lie to Fiorella about the date you called the insurer for pre-approval. Do not advise Fiorella not to contact the insurer herself because then the insurer would make her wait longer.
Fiorella figured you out, took notes each time she talked with you, and did contact the insurer, who then called you with Fio still on the line.
Fiorella knows the score now and so do you.