If that is true about the 'heart condition' then she should want to get the vaccine right away. I mean she is more susceptible to serious complications from COVID-19. Antivaxxer? It's looking that way to me... oh and if she's in aviation then her heart problem can't be that serious.
This is from the American heart association: Should I get the vaccine if I have a history of heart disease or stroke? Yes. People with cardiovascular risk factors, heart disease, and heart attack and stroke survivors should get vaccinated as soon as possible because they are at much greater risk from the virus than they are from the vaccine, according to leaders of the American Heart Association. The AHA urges people with medical conditions to discuss vaccination with their health care team.