Yes your partner is a medical specialist. I have also had partners who were nurses. My statement is still correct. There is no such thing as a “medical expert”

Yes your partner is a medical specialist. I have also had partners who were nurses. My statement is still correct. There is no such thing as a “medical expert” as the term is over broad and eg ER nurses are not required to advise patients on interactions of prescription medications. That falls to the doctor and likely pharmacist. It does not surprise me at all that a former ER nurse doesn’t know that some medication she got prescribed interacts with grapefruit juice.